Friday Night we went to see Cars 2 and Pirates of the Caribbean 4 at the Motor Vu. They say that the movies start around 9:45 but it was after 10 when ours started. Both the Sky Vu and the Motor Vu cost $7 for adults and $1 for kids (5-9). You can call 522-3111 for what movies are showing at both.
There is also a drive-in theater in Rexburg - the Teton Vu. It costs $6.50 for adults and $1 for kids (5-11). It is run by the same people who own the Rexburg Paramount - the cheap theater.
We had a good time but have a few recommendations. If you have a small car like us you may want to get there around 9 when they open so you can get a spot that won't be behind a bigger car. They play the sound over the radio and a few cars had to be jumped after, so be careful with running your battery down. You can bring your own portable radio which worked well for us.