Newegg has G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3
1600 (PC3 12800): http://www.newegg.com/Product/Product.aspx?Item=N82E16820231428
Desktop Memory for $89.99 after coupon EMCKHKJ23, shipping is free.
Note: This is the newer "X" series.