Macmall offers the Samsung 850 EVO 1TB Serial ATA 6Gb/s 2.5" Internal SSD, model no. MZ-75E1T0B/AM, for $336.34 with free shipping. (Amazon has it for the same price.) That's $13 under our mention from last month and the best price we've seen. (It's also a current low by $19.) It features read speeds of up to 540MB/s and write speeds of up to 520MB/s.