Don't even bother with eBay. It's become a dumping ground for broken rigs. Too many "it worked the last time I used it", "I'm selling for a friend", "it's from my father's (sk) collection and I don't know how to test it", yadda-yadda. The worst are estate sales where everything got thrown in a truck and some clueless person is trying to auction the stuff off, not knowing anything about the equipment's condition. Occasionally you'll see like new or new rigs posted but then the bidding wars drives the price way over it's true value.
You'll find better equipment here on eHam as well as qth.com and qrz.com. There you'll be able to confirm that the seller is in fact a ham and often you'll be able to talk with them on the phone or on the air and be able to get a better idea of the equipment's condition and why they are selling it.
Actually I have been able to find some excellent equipment on Ebay at reasonable to very fair prices . If you do some honest comparisons it becomes obvious that some of the sellers on QTH seem to look at Ebay prices for the highest selling price on their particular item , add 30% to 75 % (because they have a license ?) and post on QTH for "free" . Many of the QTH bunch refuse Paypal (and it's protection from fraud) or , if they accept Paypal they demand the buyer pay the fees !
If you look at the feedback area , you will also find a fair share of dirty deal reports on QTH as well.
Deals are where you find them . I got an excellent Icom 706MK2Ga local estate sale with microphone , owners manual and a powwer meter for $125 a couple of years ago , it looked and worked great .
I won't overlook any potential source for a good find .