Yes it's possible. I don't know where you can buy it, but according to bulbapedia Australlia had Pokemon BW Home releases. They came in collections but when the seasons ended:
There was a season 14 DigiPack (which contains all the episodes from BW) Bulbapedia
Then a season 15 DigiPack (contains all episodes from BW Rival Destinies) Bulbapedia
Also a season 16 DigiPack (contains all the episodes from BW: Adventures in Unova (And Beyond!) Bulbapedia
You can't buy the whole Black and White Series in one collection you'll have to buy them in 3 separate collections. I hope I helped.