Samsung offers its Samsung 850 Evo M.2 500GB Serial ATA 6Gb/s SSD, model no. MZ-N5E500BW, for $139.99 with free shipping. That's the lowest total price we could find by $18, although we saw it for a buck less last month. It features read speeds of up to 540MB/s and write speeds of up to 500MB/s.