MistKing timers a good, i like them allot. Also really easy to use. They allow you to turn on and off your mister many times a day for seconds at a time if needed. As long as you can get these features in a digital timer you're fine. I'd look into Walmarts, Radioshacks, Lowes, Homedepots, Pagano's, etc for other options.
MistKing is located in Canada and shipping rates are grip... I bought something for $40 bucks yesterday but paid $25 for shipping -___- so $65 bucks. Probably same price you'd pay for a timer w/ shipping.