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Raise.com
They come in $25 denominations and are over 16% off.
Use promo code TAKE5 for another 5% off for 20.5% off. There is no maximum on how large a gift card will qualify.
Start your shopping from Top Cashback and you'll get an additional 2% cashback into your account for close to 22% off. I have been use Top cashback since November of 2012 and I already have close to $500 in my account for shopping I would be doing anyway.
Use a Fidelity Visa card or Bank of America Privileges for another 1.5% off (they don't accept AMEX) for grand total of 23% off.
If you are a new customer you can use coupon code RAISE60AF and save $5 off $60. Promo codes cannot be combines. I would save the RAISE60AF for a different purchase that you can't use a promo code for.