Newegg.com has the Patriot Signature Line 4 GB Memory - SO DIMM 204-pin - 1333 MHz ( PC3-10600 ) for a good price.

Google Products Price : $25.99 ~ $36.38 Shipped

1. Newegg Price : $25.99 Shipped
2. Rebate Price : -$7.00 ( Exp : 8/15/11 )
Final Price : $18.99 Shipped After Rebate