I bought a couple 4 gig extreme III's with a rebate through calumet, never got the rebate.
I bought a kingston 4 gig card through adorama, rebate made the card essentially free. got the money in a month.
I am not much for rebates myself, so in the future, I will buy the sandisk cards... I have bent horribly two of them, when I smashed my camera strap with a pouch in my car door... bent the two cards back, still work fine...
Rebates bad for sandisk, cards are good
The current rebate is $100 for the purchase of 3 8GB IIIs...~$66/card. The article suggests that prices will go even lower in the next few months.