Next Warehouse offers the Samsung 850 EVO 250GB Internal Serial ATA 6Gb/s 2" SSD, model no. MZ-M5E250BW, for $129.84 with free shipping. That's the lowest total price we could find by $6, outside of the deal below. It features read speeds up to 540MB/s and write speeds up to 520MB/s.
A close price: B&H Photo Video offers it for $129.99 with free shipping. Note that B&H Photo Video lists this as a preorder with no release date provided.