Just out of curiosity, why not hit up Best Buy? With their extra 40% going on right now, you'll probably get even more credit
I can't speak for the OP, but I've had people ask me that, too. The OP could be in the same situation as me where our local Best Buys don't do trade-ins. The closest one with trade-ins required a 1 hr trip each way last time I tried them out. Sure I got more $, but I can't be bothered to spend all that time sadly. I wish trade-in's would expand to all BB stores. Mine has been telling me they will do it for the past year now so I don't believe them at all.
Edit: The irony is that my local BB store (which doesn't do trade ins) is only 2 blocks away from me.