Amazon offers the Silicon Power 240GB S55 Serial ATA III 6Gb/s 2.5" Internal SSD, model no. SP240GBSS3S55S25, for $54.99 with free shipping. That's the lowest total price we could find by $3. (Most retailers charge $74 or more.) It features read speeds up to 540MB/s and write speeds up to 510MB/s.