Since the goal is to stay under $8 that rules out almost all movie theaters these days...or does it? Some of the movie theaters sell tickets online and in vestibules at the theater. To the computer, a 65 year old looks the same as a 20 year old. Take advantage. Plus you can always stick around to see a 2nd movie which technically means you are only paying half.
Price: $3-$6 (Depending on the theater)
Locations: Numerous...
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Cheap and fun things to do around Minneapolis/St.Paul