Where to find used R1/3 for sale?

Sorry if this isn’t allowed. I’m looking to pick up an old used R1 or R3 to just last me a few months until I have more money to upgrade and I’ll throw it backwards as a Ghetto Arrow.

Do we trust eBay listings? All the R3s that pop up on Facebook are super far and basically brand new pricing but not condition so it seems silly to buy one of those…