Amazon has brought back its popular 3-fer offer on Blu-ray movies. Until August 21, you can get three Blu-ray discs for the price of two.

Here are the rules: buy three Blu-ray movies and Amazon will comp the price of the cheapest movie.

Amazon is including 347 titles for this deal. Some notable titles (after a quick look at the first page of movies) include: Slumdog Millionaire ($18.99), The Silence of the Lambs ($24.49), Office Space ($24.49) and The Terminator ($17.49)

There’s a 10-disc limit per person.

Deal ends: 4/21/09

Buy now: Amazon.com