I know that people are gonna laugh, but take a look at the little Lee Loader kit. When I was a kid it cost all of $9.95, and I think that they somehow maintained that price for about thirty years. It's an amazing little bit of ingenious engineering and now costs about $30.
It's fer-sure not fast, but that makes it no less satisfying.
I bought one for my first .357 magnum (a S&W Model 19) in 1974.