The TRW (now Northrop Grummon) swap meet is in Redondo Beach the last Saturday of the month, rain, shine or Christmas.
QRZ has a swapmeet on it's website.
You can also pick up open box equipment from the website of most of the ham equipment retailers.
There is also eBay. I pointed this out to InTheWood a few months ago. "There is a used but like new TH-6 on ebay going now for $126 bidding over tomorrow. Orig owner, about 20hr of use. I'd hop on that." and I believe he was happy with the unit at a great price.
Generally we've had good luck getting used ham equipment. In general hams take good care of their equip AND/OR are a fickle bunch and buy one thing after the other for the latest AND/OR buy the newest thing and like the old thing and not want the new thing, etc., etc. Hams seem to be generally honest about the quality/usage about the equipment.
Mostly we've gotten equipment from friends or swaps where we could see the items, but did get a couple Yeasu FT-51 dual-banders on ebay. That was our go to radio before the Kenwood due to the *wonderful* speaker mic that has a lighted display - great for working events. Still have them and wouldn't sell 'em
Kerin
K6KLT