In the Takasaki station, Save On I think, there’s a little movie kiosk. Pretty cheap at 100 yen per disc (~$1) and of course, since it’s open 24 hours, convenient.
Now, I can understand why you’d want a movie for 24 hours, or even 12 hours….but 8 hours? (The choice on this is 24 or 8). Ah well….the station isn’t conveinent for me, but maybe for other people who live nearby and can walk.