Other World Computing offers the OWC Data Doubler Optical to SATA Drive Converter Bracket for MacBook and MacBook Pro
, model no. DDAMBS0GB, for $37.99
with free shipping
. That's tied with our mention from two weeks ago as the lowest total price we've seen. (It's a current price low by $2.) This bracket allows you to add up to 1.5TB of internal storage to your MacBook or MacBook Pro in place of the optical drive. It comes with a 5-piece toolkit, screws, and installation guide.