I collect just about anything and everything having to do with instruction. I have the Park videos and think they are quite good. Certainly the best on the market Pre-Keeks.
Yes, they are a little pricey, but don't forget they are not a one watch wonder.
I've used them so much over the last 4 (?) years the cost per viewing is about 50 cents. Which isn't bad.
By the way, just was given a copy of "The King of Hockey." A 1930s hockey movie starring Dick Purcell (which means zip unless you are an old "B" movie and serial junkie). It concerns the exploits of Gabby Dugan of the New York Violets.

It was made as a second feature and the plot, such that it is, has Gabby romancing a society "dame" and fighting off mobsters trying to "fix" the game. As a curio piece it isn't that bad. The action sequences considering state of the art and state of the game are a lot better than Mystery, Alaska.
Old Swiss2