Mars: The Quest for Life [Blu-ray]

Africa's Elephant Kingdom [Blu-ray]
Release date: 2009-04-07; Blu-ray
Best price: $6.20
Price in other shops: $12.95

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Ancient Aliens: Season Two
AAE; Release date: 2011-06-28; DVD
Best price: $11.99
Price in other shops: $29.95

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Americas National Treasures [Blu-ray]
MILL CREEK ENT. (UNDER DIGITAL; Release date: 2010-09-14; Blu-ray
Best price: $5.99
Price in other shops: $24.98

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Human Planet [Blu-ray]
WHV; Release date: 2011-04-26; Blu-ray
Best price: $37.61
Price in other shops: $49.96

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Moonshot [Blu-ray]
A and E Home Video; Release date: 2009-11-17; Blu-ray
Best price: $2.40
Price in other shops: $24.95

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Inside the Milky Way [Blu-ray]
Release date: 2011-01-25; Blu-ray
Best price: $18.99
Price in other shops: $29.99

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The Alps [Blu-ray]
Image Entertainment; Release date: 2008-10-14; Blu-ray
Best price: $4.50
Price in other shops: $24.98

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Journey to the Edge of the Universe [Blu-ray]
Warner Brothers; Release date: 2009-03-31; Blu-ray
Best price: $19.28
Price in other shops: $29.97

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In the Shadow of the Moon [Blu-ray]
Image Entertainment; Release date: 2010-08-10; Blu-ray
Best price: $11.62
Price in other shops: $17.97

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Roving Mars [Blu-ray]
Buena Vista Home Video; Release date: 2007-07-31; Blu-ray
Best price: $6.07
Price in other shops: $15.99