Amazon.com has a great Deal of The Day in its MP3 store.
A collection of 99 ESSENTIAL CHANTS (a compilation of chants from all around the world with Gregorian, orthodox, Tibetan, African, Latin American chants, choirs from the USA, Latin America, Europe, Africa....) for a total of $0.99 only !
Six hours of music for less than a dollar!
Amazon.com: 99 Essential Chants: MP3 Downloads: 99 Essential Chants