Options for downloadable movie purchases?

I have been using Amazon Video to purchase TV episodes, then download them to my Premiere ahead of time. This is really important to me because my DSL Internet line isn't fast enough to consistently stream in full HD. But now I'm finding some movies that are only available on Vudu. I have access to Vudu through my TV (and probably my BD player) but only as streaming.



Are there any other movie services on Tivo and which allow you to download ahead of time?