Buy.com offers the SanDisk 240GB Extreme 2.5″ Serial ATA 6Gb/s Internal SSD, model no. SDSSDX-240G-G25, for $139.99 with free shipping. Although that’s $5 more than Amazon’s expired offer from earlier today, it’s the lowest total price we could find by $20. (For further comparison, we saw it briefly for $20 less in August, however, that deal lasted less than an hour.) This drive features read speeds of up to 550MB/s and write speeds of up to 520MB/s.