Rakuten Shopping offers the Samsung 840 Pro Series 512GB Internal Serial ATA 6Gb/s 2.5" SSD, model no. MZ-7PD512BW, for an in-cart price of $319.99 with free shipping. (Amazon offers it for the same price.) That's $9 under our mention from three weeks ago and the best price we've seen. (It's also a current price low by $10, although most merchants charge $360 or more.) It features read speeds of up to 540MB/s and write speeds of up to 520MB/s.