If your tap water is good/okay to use or you have an RO system, you can also make a really cheap misting system connected to a faucet or outside garden hose faucet thing, with some 1/4" tubing, some cheap nozzles, a hose/sprinkler timer, and some T connections for the tubing. On ebay they have some outdoor misting systems that have all the parts except the timer that you can hook up to a faucet for under $30.