I've bought and sold bows on ebay and have had good luck. I know others that were dissappointed. I think you need to be careful and buy from a seller that knows a little something about bows.
(I've seen folks who aren't familiar with bows list them and some of the stuff is quite amusing. I remember one where the recurve was not 'braced' but the string was on so that it was from limb tip to limb tip on the front. That's normal. What wasn't normal was that the person selling it took a picture of them drawing the bow with it that way. They were basically pulling it backwards [

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The old pearson recurvesare pretty cheap. They're kind of long though. Old bear recurves are always going to go for quite a bit. Browning recurves are nice and short and are usually pretty reasonable.
The PSE kingfishers are less than 150.00
brand new.
Local archery shops around here carry old compounds for dirt cheap. I bought a left-handed Oneida here on the HuntingNet Classifieds for 125.00.
Good luck!