Here is the weekly DVD sales ranking for January 25th - 31st.

DVD
*1, 29,902 29,902 Tengen Toppa Gurren Lagann Movie: Lagann-hen Limited Edition
*2, 22,363 22,363 Bakemonogatari vol.4 Limited Edition DVD
*3, 12,778 12,778 The Melancholy of Haruhi Suzumiya (2009) vol.6 Limited Edition
*4, 12,544 12,544 Gintama Season 4 vol.4 Limited Edition
*5, *7,449 *7,449 Kimi ni Todoke vol.2
*6, *6,613 *6,613 Fullmetal Alchemist: Brotherhood vol.6 DVD
*7, *6,523 *6.523 Toaru Kagaku no Railgun vol.1 Limited Edition DVD
*8, *5,731 *5,731 Sora no Otoshimono vol.2 Limited Edition
*9, *5,451 *5,451 Rumic World
10, **,*** **,*** Darker than BLACK - Ryuusei no Gemini vol.2 DVD
11, **,*** **,*** Bleach Hamen Kuza Kessen Hen vol.1 Limited Edition
12, **,*** **,*** Tegami Bachi vol.1
13, **,*** **,*** Chrome Shelled Regios vol.11 Limited Edition
14, **,*** **,*** Katekyo Hitman Reborn! Mirai Hen X vol.10
15, **,*** **,*** Tengen Toppa Gurren Lagann Movie: Lagann-hen Normal Edition
16, **,*** **,*** Kämpfer vol.2
17, **,*** **,*** Mobile Suit Gundam MS Doga Zukan vol.3
18, **,*** **,*** Kuchu Buranko vol.1
19, **,*** **,*** Nogizaka Haruka no Himitsu: Purezza vol.2 Limited Edition
20, **,*** **,*** Isekai no Seikishi Monogatari vol.9

Blu-ray
*1, 48,000 48,000 Bakemonogatari vol.4 Limited Edition

Sources: Youtaiju, Mainichi, Oricon DVD Ranking