Forget my Amazon suggestion, they are not supporting rentals to tablets, except maybe Kindle Fire. And moe about streaming than downloading. They want to compete with Netflix, not with their own sales of DVDs and BluRays.
Apple business model on movies is download a purchase to (iOS) tablets, phones, Touch, but rentals or limited time to play for downloads to computers and Apple TV.
I checked prices iTunes Store vs Google Play, they seem to be in the same place for same classes of material, whatever is commercially "hot" is going to be about what it would cost on a disc. Google does have some stuff that is free, lowest prices I see in iTunes Store is about a dollar for a TV show.