Kingston HyperX 4GB (2 x 2GB) DDR3 1600 (PC3 12800) Desktop Memory $39.99

Newegg.com has the Kingston HyperX 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory for $39.99 after $30 rebate with Free Shipping.