Tigerdirect has the SandForce-based Adata XPG SX900 512GB SSD drive for $249. This seems like a really good deal on a decent drive.
ADATA XPG SX900 512GB SSD - 2.5 Form Factor, SATA III 6 Gb/s, Up To 540 MB/s Read Speed, Up To 465 MB/s Write Speed - ASX900S3-512GM-C at TigerDirect.com
ADATA XPG SX900 512GB SSD - 2.5 Form Factor, SATA III 6 Gb/s, Up To 540 MB/s Read Speed, Up To 465 MB/s Write Speed - ASX900S3-512GM-C at TigerDirect.com