The Logitech K780 is one of those keyboards people quietly refuse to give up. It pairs with three devices at once, flips between your work laptop, your phone and your tablet with a single key, and has a moulded cradle along the top edge that props a phone or iPad at a readable angle while you type a long reply. Buying one used in Australia is a smart move, because the thing was built to outlast the desk it sits on, and a second-hand unit does the same job as a new one for a fraction of the price.
The numbers that change the conversation
Top used logitech k780s on eBay right now
Here is what is currently listed from Australian sellers, sorted so the best-value units surface first.
Listings update automatically and open in a new tab.
Why second-hand is not “second best”
A keyboard is the rare gadget where used genuinely equals new in the ways that count. There is no screen to wear out, no battery cell to degrade, no internal storage filling with someone else’s data. The K780 runs on two replaceable AAA batteries that Logitech rates for up to two years, so a previous owner cannot leave you with a tired, non-removable battery the way they can with a phone or a laptop.
The parts that matter most are the scissor-switch key mechanisms and the rubber feet, and both are durable by design. The K780’s keys are the flat, round-cornered “perfect stroke” type, quiet and shallow, and they are rated for millions of presses. A keyboard that has spent a year on a tidy home desk has barely started its life. The wireless side is just as reassuring, because the keyboard talks over standard Bluetooth and over Logitech’s Unifying USB receiver, and both are mature, well-supported technologies that have not changed.
A K780 with light desk wear types exactly like one fresh from the box. You are paying for a logo on a sticker, not for performance.
The savings are real
The second-hand electronics market in Australia is growing at roughly 10% a year, and accessories like keyboards are where the value is clearest. A new K780 sits at the premium end of Logitech’s mainstream range, so the gap to a used one is meaningful in real dollars. Because so many of these keyboards came bundled with office setups and upgraded desks, supply is steady and you are not fighting over scarce stock. That keeps used prices honest. Spending less on the keyboard also frees up budget for the AAA rechargeables or a spare Unifying receiver that make it genuinely set-and-forget.
New vs used, side by side
| Brand new | Used / refurbished | |
|---|---|---|
| Typical price | Full RRP | 20-60% less |
| Easy-Switch + cradle | Yes | Identical, unchanged |
| Batteries | Fresh AAAs included | Swap in your own, ~$5 |
| Unifying receiver | In the box | Confirm it is included |
| Environmental cost | New manufacturing CO2 | Re-uses a built device |
The five-minute checklist before you pay
- Ask which devices it was paired to. The three Easy-Switch keys (1, 2, 3) should each click and hold cleanly; a seller can confirm all three still pair.
- Check for the Unifying receiver. The tiny USB dongle is easy to lose. The keyboard still works over Bluetooth without it, but a missing receiver is a fair point to negotiate on.
- Inspect the cradle channel. Run a finger along the rubberised slot that holds your phone or tablet. It should be intact and grippy, not torn or stretched out.
- Look at the battery compartment. Ask for a clear photo of the contacts. Corrosion from old leaking batteries is the one fault worth avoiding on any AAA-powered keyboard.
- Confirm the layout. You want the standard ANSI/AU layout with the right-hand number pad; check the Enter key and shift keys look normal in photos.
- Check the rubber feet. A K780 that does not skate around the desk has its grip pads intact, which keeps the typing angle stable.
You have more protection than you think
When you buy from a business seller rather than a private individual, the Australian Consumer Law still applies even though the keyboard is used. Goods must be of acceptable quality and match their description, so a K780 advertised as “fully working, all three Easy-Switch channels pair” must actually do that when it arrives. Buying through eBay adds the Money Back Guarantee on top, which covers items that turn up faulty or not as described. Keep the listing screenshot and the seller’s messages, and you have a clear paper trail if a claim is ever needed.
Ready to find yours?
Compare current prices and grab a tidy used K780 from a trusted seller here.
Red flags to walk away from
- “Untested” or “as-is” with no pairing photo. For a wireless keyboard this usually means it has not connected, or the seller will not stand behind it.
- Visible white or green crust in the battery bay. Leaked-battery corrosion can kill the contacts; not worth the saving.
- Sticky, shiny or missing keycaps. Heavy wear on the most-used keys hints at far more hours than the listing admits.
- A cradle slot that is cracked or has lost its rubber. That cradle is the K780’s whole reason for existing, so a broken one defeats the purpose.
- A price that matches new. If a used unit is barely cheaper than retail, there is no reason to take on the small extra risk.
Frequently asked questions
Does the K780 work with both Windows and Mac? Yes. It has dedicated key markings for both, and you can assign your PC to one Easy-Switch channel and a Mac or iPad to another. It also handles Android and iOS through the cradle.
Do I need the Unifying receiver, or is Bluetooth enough? Bluetooth alone is fine for most modern laptops, phones and tablets. The Unifying receiver is handy for older desktops or machines with flaky Bluetooth, so it is a bonus rather than a must-have.
Will my phone actually fit in the cradle slot? The slot is designed to hold phones and most tablets, including larger models in a slim case. Very thick rugged cases may need to come off, but standard cases sit fine.
Are the batteries replaceable? Yes, it takes two standard AAA batteries that you can swap in seconds, and Logitech rates them for up to two years. A used unit’s battery life is a non-issue.
The bottom line
The K780 was designed to be a long-term desk fixture, and that is exactly what makes it a great used buy. Nothing critical wears out, the batteries are replaceable, and the wireless tech is unchanged from the day it launched. Spend five minutes checking the battery bay, the cradle and the three Easy-Switch channels, buy from a seller who stands behind the unit, and you get the full multi-device experience for well below the price of new, while keeping one more working keyboard out of Australia’s e-waste stream.
This article may contain affiliate links; see our Affiliate Disclosure.