You can run ads in newspapers and have a website that says you buy used stuff (the stuff you want to buy), so if you want to buy bikes simply say "I buy used bicycles". This way you are also in the driver's seat, you decide what you want to pay! ]Used products can be ...
eBay is a good place to find big lots of good used stuff, but it's not the only place. Bartertown has a rep for people putting ridiculous price tags on marginal product, but there are some deals to be had. Local message boards are a good place to find out who is selling their ...