Amazon offers the Samsung 850 Pro Series 512GB Serial ATA 6Gb/s 2.5" Internal SSD, model no. MZ-7KE512BW, for $289.99 with free shipping. That's tied with our mention from Black Friday weekend and the lowest total price we've seen. (It's also a current low by $20.) It features read speeds of up to 550MB/s and write speeds of up to 520MB/s.