Well, you could either do what was said and offer really low prices, or not buy them at all. But there's a problem with both, your website is webuyanycycle. So to not buy bmx's is going against your website name - which won't do your rep any good. But what also won't do your rep any good is offering people stupidly low prices on their bmx's. Best thing to do is make a deal with some bmx know-it-all who's got a little free time on their hands, make it do they don't ever have to have anything to do with the business other than valuing a bmx, then, give them a % of the profit. That way if they estimate too low, they miss out on money, and if they estimate too hight, little profit is made, meaning they get next to no money.