As one of its daily deals, Amazon offers the SanDisk Extreme 500 240GB Portable SSD, model no. SDSSDEXT-240G-G25, for $79.99 with free shipping. That's the lowest total price we could find by $30. It features a shock-resistant case, read speeds of up to 415MB/s, and 128-bit AES encryption software.

Also available is the SanDisk Extreme 500 480GB Portable SSD, model no. SDSSDEXT-480G-G25, for $129.99 with free shipping. That's the lowest price we could find by $50, although most stores charge at least $200. Both deals end today.