$69.99 4GB SanDisk MS PRO Duo @ Fry's After MIR
Fry's.com has 4GB SanDisk Memory Stick PRO Duos for $99.99 with a $30 mail-in-rebate, bringing the final price to $69.99. At the time of this post, the Fry's website says to call for availability but you may be able to find this deal in your local store. If you don't have $300 to pre-order the upcoming 8GB MS PRO Duo then this deal may be for you.
Buy 4GB SanDisk MS PRO Duo