Currently at the Discovery Store, you can get this 4-disc Best of Discovery Set for only $4.97. To make the Deal even Better use code SAVE5 and get it Free. Just pay shipping. I found this Deal on page 9.
The set includes: Deadliest Catch Season 3, Planet Earth: The Filmmaker’s Story, Man vs Wild Season 2 and Unfolding Universe.
Thanks, Frugal Coupon Living