A good guide for how much you can get is checking the ended listings on Ebay. Keep in mind though that's not exactly what they're going to offer you. They have overhead and have account for that like any other shop.
It'd be best to being it in most likely, usually shops always want to visually inspect before offering. I'd say give them a call first to see if they're interested before heading out there.
Thanks! Your answer is awaiting moderation.