There aren't any prices in the system yet, nor could we get an idea of the extent of the range available for trade-in (as in, we don't know if you can trade in a 2001 original), or even an iPhone). So this could be an early listing, or it could be a test market thing.
The fact you can trade these devices in is strange enough, but GameStop doesn't usually accept trade-ins on things it doesn't also sell new. Could the world's largest specialist games retailer soon be selling iPod Touches on the shelf next to a DS or PSP?
[Source: Kotaku]