I purchased one of those cheap fog machines (30$) for Halloween this year. It works fine, and it even comes with an IR remote for stealthy operation! It did what it should, it spewed out some fog, but it was hardly as satisfying as I had hoped. The smoke dissipated quickly and didn't have a whole lot of substance to it. It was wispy, thin, and light, and I was starting to think to myself that I should have splurged on the more expensive model. Some reading on Google let me know that the secret to good thick billowy fog that clings is chilling it down. Blow the smoke over ice or dry ice. Well I cannot readily get my hands on dry ice, and initial tests of placing an ice pack in the path of the fog jet worked great. It really does improve the quality of the fog. I quickly set about looking through my junk bins to slap together a cheap chiller. I am pleased with the results.