Maybe you can build one yourself? I haven't built one myself but I don't think it would be too difficult nor too expensive.
Just make a misting system powered by a strong enough water pump and connect the pump to a timer at the electrical plug (same as your light timers).
Some supplies you'd probably need are pvc pipe or airline pipe (not sure on a good diameter size), pvc pipe connectors if you go with pvc, a submersible pump (do some research to find out how strong it would need to be), a large water container, and some suitable nozzles that will fit the tubing of your choice and an electrical timer that your pump will connect to. Then don't forget a drainage system or some sort of catchment container. I'm sure you could find some good ideas on YouTube. I think you would want to be very sure your container doesn't run out of water with this option because your submersible pump will then be taking air in and I think it could be damaged.