Correct me if I'm wrong but here's a good deal for the fastest SDHC -- the Sandisk Extreme III 8GB for $79.95 - $40 rebate = $39.95. Buy 2 with a $90 rebate, buy 3 with a $140 rebate (for about $33 each)!
http://www.bhphotovideo.com/c/produc..._III_SDHC.html