MacMall offers the Samsung 850 EVO 1TB Serial ATA 6Gb/s 2.5" Internal SSD, model no. MZ-75E1T0B/AM, for $349 with free shipping. (Amazon charges the same.) That's the lowest total price we could find by $29, although we saw it for $9 less three weeks ago. It features read speeds of up to 540MB/s and write speeds of up to 520MB/s.