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UPDATE: Unfortunately this coupon code is no longer working.
Thanks to Miles to Memories, there is a coupon code that is currently offering 20% off at eBay including other merchant gift cards sold through eBay. The code is: CTWENTY. Here is a link to all the discount gift cards, full priced gift cards, and travel specific gift cards.
For example, I purchase a $100 BP gas card that was being sold for only $90. After the 20% code was applied it came out to $72. The only caveat was that I had to pay through my PayPal account for the code to work.
I do see through this Slickdeals thread that some buyers have having issues, but some also seem to get the code to work, so your experience may vary. Feel free to report back!