We bought this fog machine off craigslist. It's an American DJ Fog Storm 1200. They are offered on Amazon for 149. We got our for 85 bucks. Here's a little demo.

We used Froggy's juice... I LOVE Froggy's fog juice. It's the best stuff out there in my opinion.

Also, the juice we bought was meant to be used with a chiller. We used a barrel chiller at night during our haunt and ran hose along our fence line. The fog once chilled hugged the ground and rolled toward the house perfectly.

You'll see how the wind reacts with the fog. Oh, ignore my crazy commentary. I'm exhausted from setting up for the two days beforehand.

I recommend both products!

http://www.youtube.com/watch?v=zhXYWvBnvAk