Newegg has the ADATA Ultimate SU800 512GB SSD (ASU800SS-512GT-C) on sale today for $142. There's also a $20 mail-in rebate that drops the final price down to $122. Shipping is free.
ADATA Ultimate SU800 512GB 3D NAND 2.5 Inch SATA-III Internal Solid State Drive (ASU800SS-512GT-C)
Rebate: https://images10.newegg.com/uploadfiles ... 17jd56.pdf
Here's our review of the 512GB version of the ADATA Ultimate SU800: http://www.cdrlabs.com/reviews/adata-ul ... drive.html