eBay. The secondary market for high-end network switches is excellent if you’re a buyer.
In fact I'm buying two new R710s to replace my very old UAC AP Pros. Was going to get the new AP 6 LR but after UIs current woes (and them dropping support for my APs way too early) I'm done with them.
Though, After using Ruckus in Corp/Enterprise they've sold me on how capable their APs are, it's real deal high density stuff.