With the rash of new cheap imported bows from China/Korea, quality used domestic bows (like Hills) are getting harder to sell at fair prices.
A new Big Five (and other 4-lam Hills) with no 'frills' sell for about $625 shipped. A 'very good condition' used bow of this type would suggest that it is in like-new working condition with only minor cosmetic marks/wear (including the string) and no deep surface or finish dents or scratches, and with the original or equivalent leather rest/sideplate. IMO, a reasonable price range for such a bow would be $375-$450 which includes insured shipping in CUSA.
Sure they cost more than a Chinese import, but you generally get what you pay for.