Are there any other automatic dice rolling devices besides dice towers?

Not "automatic" strictly speaking, but there are few more satisfying sounds than dice being rattled in a nice leather or felt lined dice cup to then tumble onto a felt lined dice tray. It's one of the major appeals of Backgammon. (Which is where I use them.) You could probably get a good Backgammon dice cup fairly cheap or for something more fancy and RPG specific I've heard good things about Q Workshop dice cups like this https://www.amazon.com/Q-Workshop-Games-Black-Leather-Symbols/dp/B003TLFHQY/ref=sr_1_3?