Maybe try Sonos ‘certified refurbished’ products at Sonos.com for your country of residence. See here just as an example (UK site):

https://www.sonos.com/en-gb/shop/certified-refurbished

The ‘current’ version of that speaker is the Sonos Five.

If you’re trying to get second PLAY:5 gen 2 for a stereo pair, or filling out a surround pair, you may also want to look at eBay. It’s been quite a few years since those were manufactured, so finding a ‘new in box’ version may be quite challenging.