Amazon offers the Samsung 840 Pro Series 512GB Internal Serial ATA 6Gb/s 2.5" SSD, model no. MZ-7PD512BW, for $249.99 with free shipping. (Buy.com via Rakuten Shopping charges the same via coupon code "549BB3E".) That's the lowest total price we could find by $40, although we saw it for $7 less three weeks ago. It features read speeds of up to 540MB/s and write speeds of up to 520MB/s.