I sent an item in for warranty and got a $500 gift card in the mail because they don't sell it anymore. I think 25% off is fair. $375 cash or personal check (if I don't know you, I'll wait for it to clear).
There is a security number on the back of the card so if we meet in person in Golden or Denver you could call the 800 number, verify the amount of the card, and then hand over the cash. May also be able to just meet at the North Face store in Boulder.