Amazon.com is running another buy 2 get 1 free sale on a slew of Blu-ray discs. What’s great is the discs are already discounted in price, not like some retailers who offer deals like this but with the MSRPs still intact. Some great titles off the top of the list include “300”, “The Terminator”, “Black Hawk Down”, and “When We Left Earth – The NASA Missions”. The offer runs until April 24. Check out the full list of titles.