Corsair XMS2 Xtreme Performance 4GB (2 x 2GB) PC2-6400 DDR2 Memory Kit for $14.99 after a $25 rebate. Here is a screenshot for your reference. Select in-store pickup to save on shipping if there is a Fry’s near you. Otherwise, shipping is between $4 to $7 depending on the location. For the technically inclined, this set of RAM has a voltage specification of 1.9v and operates at 800MHz with 5-5-5-18 timing. Here is additional information. Alternatively, it is available here for $23.90 shipped after a $25 rebate.