All four seasons of the new Battlestar Galactica are on sale at VUDU for $10 each, for a grand total of $40. This does not include the movies, such as "Blood & Chrome", "Razor", or "The Plan".
Season 1
Season 2
Season 3
Season 4
The initial mini-series is also on sale for $5:
Mini-Series
And the original 1979 series is available for $10 as well:
Season 1 (Classic)