Newegg.com has the Corsair XMS 4GB 240-Pin DDR3 SDRAM DDR3 1333 Desktop Memory Model CMX4GX3M1A1333C9 for a good price.

Pricegrabber Price : $34.99 ~ $45.94 Shipped

1. Newegg Price : $26.99 Shipped
2. Rebate Price : -$15.00 ( Exp : 8/17/11 )
Final Price : $11.99 Shipped After Rebate