Hello experts! Advice?

I have a move and a move2  and they work just GREAT together using airplay... Chose both and crank it up!! . I can even select my TVs and it will show the song and album art from Spotify..

im sure this is old news to you yall ...but Im thrilled! 

Having so much fun I'd like to buy one or two or three more speakers to fill in the rest of the house..

What is a good older Sonos that I could find on FBmarketplace or eBay that would work  on airplay along with the current two Moves? Battery is optional.

Thanks y'all!