Amazon's video service, Unbox, is offering a number of movie classics for free. Some are purchases, in that they never expire, while others are rented, meaning you must watch them within 30 days or they expire. If you haven't checked out Unbox yet, this is a no-cost way to do so, though of course you have to be in the mood for these older films.

Download some of the best films ever made in our Free Classic Movie Sale. No obligation, no cost--all you have to do is download by Nov. 18. Click now, watch tonight.

Free purchases include Charade, His Girl Friday, House on Haunted Hill, Man with the Golden Arm, My Man Godfrey, and several others. There are an even wider range of free rentals, like Nosferatu, Iceman Cometh, Mark of Zorro, and 8 1/2. On that note, for just a few bucks, you can purchase movies like To Kill a Mockingbird, Journey to the Center of the Earth, and The Italian Job too. Check it out.