After a good, high-end bike shop handling Trek (among other lines) closed in my area (Danzeisen & Quigley in Cherry Hill NJ), a Trek store opened nearby. I stopped in recently and they told me they take trade-ins, giving Bicycle Blue Book values. I believe BBB values to be way low, sometimes bordering on ridiculous. Still, the shop offers trade-in credit. I don't know what they do with the bikes, as apparently they don't use valuable floor space to display any used bikes.