The liquid nitrogen around here costs about 3.75 per liter, which makes it about 4 times as much as gasoline. Depending on the technique you use you will need about 2 liters to spin one liter of mix (it will require proportionately less as you have more mix to spin and of course it also depends on the temperature of your mix as well. Also, if you use a faster method to make the ice cream it will also require less liquid nitrogen... but the quality will generally suffer a little.)
The texture difference between ice cream made by a high-end machine and LN2 are almost indistinguishable, and requires a bit of finesse to get it to turn out without chunks of frozen globs so depending on why you're using it you may wish to stick with the cheaper (over the long term) method. The restaurant I'm at uses a 40L insulation container, so each fill up costs around 150 dollars.
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"If it's chicken, chicken a la king. If it's fish, fish a la king. If it's turkey, fish a la king." -Bender |