Some of them fell into public domain, so you may find quite a few DVDs of Betty floating around... even at Wal-Mart. Paramount licensed Olive Films to make a special four DVD set of some of their original prints.
Oh... if you are ONLY beginning to explore classic animated cartoons of both Hollywood and New York (and some Miami for Fleischers) of the 1920s-60s, you are in for lots and lots of fun!
Thanks. That is what I surmised. Fleischer is great. I can't wait to see more of his animation.