Wholesale Tag via Amazon offers the SanDisk 256GB X300 2.5" Serial ATA 6Gb/s Internal SSD, model no. SD7SB6S-256G-1122, for $85.89 with free shipping. That's the best price we've seen for any SanDisk 256GB SSD in nearly a year, and the lowest total price we could find by $3, outside the offer listed below. (For further comparison, most merchants charge $94 or more.) It features read speeds of up to 520MB/s and write speeds of up to 460MB/s.

A close price: NeweggFlash offers it for $85.95 with free shipping.