Not bad and certainly cheap. A good small scale alternative.

But for about $250 you can go to a welding supply and get a 20# cylinder of CO2(carbon dioxide) with a hose and regulator valve. I get my tank refilled about once a year for approx $24 and I can put down hundreds of rodents during that year with less work. Tubing from the cylinder goes to a valve placed in lid of blanket rubbermaid box with no holes in it. The regulator gauge tells me how much gas is left in the tank. I can do 20-40 large rats or anything else in about 6-8 minutes. Quick, efficient and no fooling with dry ice. Then I can vacuum seal anything I want to freeze for use later.

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