I remember it as being in the $3 range or so though someone upthread wrote it could be as high as $7. And there's gas/time and late fees. And no guarantee of availability.
For current content, there's also Redbox today.
Personally, I'm basically fine with 1 or 2 streaming services for a combination of general content and exclusives and renting/buying the rest in some manner. I should cancel my cable though because I never watch it even though it means that leaves me without live TV. Yeah, I know there's YouTube TV but I really don't watch enough for it to be worth it.