Adorama offers the Plextor M5Pro 512GB Serial ATA 6Gb/s 2.5" Internal SSD, model no. PX-512M5PRO, for $379.99. This $30 mail-in rebate drops it to $349.99. With free shipping, that's $0.68/GB and the lowest total price we could find by $45. It features read speeds of up to 540MB/s and write speeds of up to 470MB/s. Rebate expires December 1.