Gift certificates at online retailer for papercrafting, Paper Wishes, are 10% off from December 10th to December 16th. Discount will be applied when the item is in the cart. I tried this with two certificates and the discount was applied to both at once (there is a promo code for the discount, but it's applied automatically during checkout).
No shipping cost to mail a physical certificate. If you are in the Portland, OR area, you can arrange free store pickup at the company's brick-and-mortar store, Hot Off The Press, at 1250 NW Third Ave, Canby, OR. Minimum purchase amount for both email and physical versions: $5.00.