Rob-This is something you're going to have to take up with Backcountry's customer service by either calling, e-mailing them at service [at] backcountry.com, or using their live chat function.I'll be a pretentious jerk though and offer my unsolicited advice: Backcountry provided you a great product, downright dazzling customer service, and got you the gear you needed when you needed it. Backcountry sold something then at a set price, and you accepted the terms of that sale and acknowledged that the product and service were clearly worth what you were paying.Now that you've found a better deal, you want out. While your request is in theory reasonable, in reality you're basically wanting your cake and to be able to eat it too.If you really want to stick it to them, buy two canisters now and return one of the new ones from the old invoice. If you're willing to accept that you got exactly what you paid for the first time you bought it, honor that customer-seller agreement you made and just buy the second one. Besides, it'd be like you're getting both of them at 10% off.For whatever it's worth, this canister absolutely rocks. I'm glad I have mine every time I manage to sneak away up to Yosemite.bc.com is a very fair company to work with. Hope all works out for you.