So I'm thinking of preordering the Anzio OVA, but I'm confused as to why there's two separate listings for it on Amazon.
ガールズ&パンツァー これが本当のアンツィオ戦です! [Blu-ray]
【Amazon.co.jp限定】 ガールズ&パンツァー これが本当のアンツィオ戦です! (杉本功描き下ろし絵柄スチールブックケース付) [SteelBook] [Blu-ray]
Seems like the first entry is from February, while the second appeared in March. The second looks like it's the same thing but comes with something cool, I think? (It would explain the higher price.)