I would just explain to the guy that it was a deal you couldn't say no to. Simple as that. I sure wouldn't! I seriously doubt that he'll forcibly eject yuo from the premises. And even if he does... well... there's nothing like Bass Pro to make you want to take of things on your own. hehe...
Seriously though, you bite the bullet, and take th heat for a bit... Buy the things you need from him... alls well that ends well my friend.