Where can I find Видео for rosario vampire season 1?

Either youtube, или google: bittorrent rosario vampire.

Well if registered on bleachexile Ты can download them :)

animefreak and veoh have good quality vids

sky7anime.net или voober.com.there are some episodes on Youtube but incomplete so i suggest to Ты those 2 websites.both 2 websites have complete episodes of the series.

Funimation (free if not expired)
Netflix (paid)
YouTube (free)
Crunchy Roll (paid)
или if Ты look it up on Google there should be some English dubs available for free