I'd make an analogy to trading in your used car for a new one. You can (usually) get more if you sell it yourself, but it can also be a hassle.
Suggest that you get the store's offer and compare it to prices here, EBay, etc. If it seems fair, trade it in.
Suggest that you get the store's offer and compare it to prices here, EBay, etc. If it seems fair, trade it in.