I found a few playlists of the Blondie movie series on YouTube that have the whole series of 28 comedy films. They all seem to be the same uploads and while some films have a bigger video file than others they're pretty much all watchable. At least, if you aren't expecting much. I watch a lot of this on my PC and I'm pretty close to the screen so the smaller file doesn't bother me any. It would be nice to have a DVD set of the films but that doesn't seem to exist except as a bootleg. There's one on Amazon for 35 bucks and that seems like a lot to pay, even for 28 films. I've only watched the first of the films, Blondie 1938, and it was funny enough to give me a giggle but I could see from that one that I might get tired of Dagwood pretty quick.
Jean Singleton and Arthur Lake play Blondie and Dagwood Bumstead in all 28 films. They made 14 films and in 1943 Columbia thought that the series should stop. Fans and theater owners rallied around and in 1945 they got Columbia to start up the series again. It lasted another 14 films. Jean and Arthur played their characters on the radio during the same time period.