Crucial M4 2.5" 256GB SATA III MLC SSD $150 at eBay

Update [8AM PT]: Ends 2/19 at 8AM PT. eBay with Adorama has it for $150 with free shipping.

Newegg has the Crucial M4 CT256M4SSD2 2.5" 256GB SATA III MLC Internal Solid State Drive (SSD) for $170 - $10 off with coupon code EMCYTZT2956 [Exp 2/19] = $160 with free shipping. Features up to 415MB/s read and up to 260MB/s write speeds and a 3 year warranty.

Kingston SSDNow V300 SV300S37A/120G 2.5" 120GB SATA III SSD for $80 shipped w/ code EMCYTZT2964 [Exp 2/18]