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Disclaimer - The Discover offers are no longer valid.
Raise.com
They come in $100 denominations and are 12.9% or 12.8% off.
Use promo code THANKS for another 3% off for close to 16% off. There is no maximum on how large a gift card will qualify. You can add starbucks egift cards right to your existing Starbucks account
Start your shopping from Top Cashback and you'll get an additional 2% cashback into your account. I have been use Top cashback since November of 2012 and I already have close to $300 in my account for shopping I would be doing anyway.
Pay with your Discover Card and you will get 5% cashback on any online purchases until the end of December (limit of $75 cashback for the quarter).
If you are a new customer you can use coupon code RAISE60AF and save $5 off $60. I don't know if they can be combined because I am not a new customer but give it a shot