Newegg has got the OCZ Agility 4 512GB SSD (AGT4-25SAT3-512G) on sale for $299.99. There's also a $20 mail in rebate, that drops the price down to $279.99. You also get a free SSD upgrade kit and its shipped free.
OCZ Agility 4 AGT4-25SAT3-512G 2.5" 512GB SATA III MLC Internal Solid State Drive (SSD)
Rebate: http://images10.newegg.com/uploadfilesf ... 12ey39.pdf