SanDisk 4GB Memory Stick PRO Duo $49.99 @ Fry's
Keeping with a string of great deals on the SanDisk 4GB Memory Stick PRO Duo, Fry's has them right now for $49.99 ($69.99 - $20 mail-in rebate). I wasn't able to find it in their online store but you should be able to pick one up at your local Fry's.