I'm experimenting with a fogger in a 4x14 room. It has ten emmitter heads, seperate power supply, cost 100 on sale. It's intended for making smoky ponds, but I use one at work for grafting and cuttings chambers. It takes a little DIY'ng to get it going in each situation.
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fog is about sterile, misters are not. Misters need to be cleaned inside once in a while, or they will grow bacteria/mold in the tubes, etc.
I am having trouble with keeping water level up though, gotta check a few times a day, or set up a bigger volume reservoir.