where do you buy liquid nitrogen?

You normally won't get nitrogen in your average drugstore. If you know someone that works at an university or in chemistry ask them.

Most large animal vets should know how to get it. They tend to store a certain animal product for the artificial insemenation of cows and such.

wes

First google it up and make sure you understand the safety precautions. You say you're aware of them but burns and asphixiation are very common so know what you're doing. You should be able to get a 5 gallon Dewar at most welding supply houses or gas suppliers. Check your local yellow pages. It's really quite commonly available.

Good luck on the project - sounds like fun!

Call PraxAir, 800-462-0245. They can direct you to a local supplier.

Well...Find you nearest supplier and, well, steal it! It's more fun that way and you can try to take as much of it as you can carry...Not it your hands, or pockets...In a proper container.

Boris: "I AM INVINCIBLE!!!!!!!"

From the movie Goldeneye...

Well, that scene always pops up when someone mentions liquid nitrogen 8O

Nitrogen leaks in a typical factory, for instance, displace an enormous amount of useable air by binding with the oxygen in it.

http://www.chem.purdue.edu/chemsafety/Chem/ln2.htm
1L of it that is spilled will result in 24.6 cubic feet of gas, which then displaces 5-6 times that mass of breathable air. In seconds. You won't feel light headed since our bodies naturally ignore nitrogen changes(since it's mostly what "air" is made of) - you'll just pass out and die. It's a lot like carbon monoxide that way, just it gets out of hand very quickly when things go wrong(the freezing body parts and substances exploding from thermal shock and such aside).

You're much better off experimenting with thermoelectric cooling instead. You can easily get virtually the same results with far less risk.

Every City (just about) Has a welding Supply Store or one that fill's OS tanks. Most all have NO2. When asking to buy some-Be friendly, knowable and sound like you know how to use it. AND have a proper storage tank regardless of size. Above all all check prices at different locations, it can vary a lot.

2 years and 6 months too late.