Newegg has the G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 2133 for $ 57 with free shipping. That’s one of the lowest prices for 8gb 2133mhz ram I’ve seen in a while.
G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 2133 Newegg.com $57 + free shipping