The height of my movie-going was in the mid 70's, right after I got out of high school. This was before video rental. I lived within walking distance of 5 theaters. The cheapest was 60 cents. It usually showed schlocky horror movies. Homeless people would sleep there during the day.
The others were .75, 1.00, 1.25, and 2.50. The first two were decent second-run theaters (a category which has been replaced by videos/DVDs). The $1.25 one was an old movie palace, built in the 20's (the Granada, near Loyola University in Chicago). The $2.50 one was the 400, which showed new art and foreign movies.
When Hollywood movies started to be available as video rentals, a lot of the second-run theaters switched to foreign-language movies. When I first moved to Seattle, the theater which is now used by Taproot Productions for live plays showed Chinese-language martial arts movies and Spanish-language romances.
I usually see movies on video, unless I'm in a hurry to see them, or they are big FX movies, which are more impressive on a bigger screen. The large chains have discounts before 6 pm, though I think they charge $7.50 now, so it doesn't seem like much of a discount. Landmark Theaters, which owns the theaters on Capitol Hill and near the UW, has fewer discount matinees scheduled, but they sell five discount passes at a time for $30, which works out to $6 each, the price of the discount matinees.
I live a few blocks from a rental store that charges 2.50 for older videos, and 3.75 for new ones.