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A air duster can can go between $10 to $15 on top of the price of the beer...
To cool your drinks quickly...
drinks and lots of ice in a cooler/plastic tub, etc.
Add some water. You won't need a whole lot, since the ice will melt a lot in the next step.
Mix in some coarse salt. You can buy it for pickling etc. A big 5lb bag goes for about $3 Ordinary table salt works too, and mixes in easier, but it'll cost a lot more.
The ice will melt really fast, and the water temperature will drop to about -20C as opposed to the 0C of ordinary ice water.
It'll cool your drinks quickly, cheaply, and without dumping unnecessary gasses into the atmosphere.
Freon is another name for Tetrafluoroethane.
http://en.wikipedia.org/wiki/Tetrafluoroethane