You might want to put a "WTB" (want to buy) post in the Personal Classifieds while you look around. Sometimes people are wanting to sell something but not sure there's a buyer out there. I'd be kinda specific about which units I was interested in, just to cut down on offers on units you really aren't interested in (or prices like you mentioned).
Other than there, eBay is about the only other option I'm familiar with ... but, there might be something in the Facebook Marketplace (if you're on Facebook). If you have a local bait store that has a consignment deal, or a local reputable pawn shop, they might be worth a look.