Lexar and Sandisk are doing rebates. I found a site selling Extreme IV 8gb cards for $85 and if you buy three, you get a $150 prepaid visa card. That's like only paying $100 in the long run.
But unless you have a camera that can utilize a UDMA card, then it's almost pointless to spend that money when you can get 8gb Extreme III's for about $50ish iirc. They're running a rebate on those, but they're smaller. I think it's like $80 or so back for three Extreme III cards.