Amazon offers the Samsung 840 Pro Series 512GB Internal Serial ATA 6Gb/s 2.5" SSD, model no. MZ-7PD512BW, for $359.99 with free shipping. (Buy.com via Rakuten Shopping offers it for the same price.) That's $20 below our February mention and the lowest total price we could find by $22. It features read speeds of up to 540MB/s and write speeds of up to 520MB/s.