In the forums you will get reseller prices for minor, non-traffic domains. Reseller prices tend to be 1/10 to 1/20th - or less - of what you might expect an enduser would pay.
You will get traffic offers - 2 years to 10+ years "proven PPC revenue" - for proven traffic domains.
How to evaluate sale prices:
[webmasterworld.com...]
How to market and sell a domain:
[webmasterworld.com...]
Another thing you should do, if they are undeveloped, would be to park the domains with a ppc provider. You will get offers from people landing on your page. The good thing about those offers, is that many of them are from "quality retail buyers".