Discovery Channel Store offers The Discovery Channel's Life: Disc 1 on Blu-ray Disc for $4.99. Coupon code "SAVE5" makes it free. With $2.95 for shipping, that's $21 off and the lowest total price we've seen for this disc. Sales tax is added where applicable. It includes the first three episodes, "Challenges of Life", "Mammals", and "Reptiles and Amphibians". Note that this is the Discovery Channel version, narrated by Oprah Winfrey.