Ok, I'm so jealous that I went ahead and purchased this battery for $16 at Amazon. I believe it is the same one mentioned by the XDA folks in this thread:
Samsung 1800mAh Battery Photos
Samsung Genuine 1800mAh Standard Battery for Sprint Samsung Galaxy S II Epic 4G Touch d710
http://www.amazon.com/gp/help/seller...A1FBR7E8HT21EQ