Can you buy liquid nitrogen?

Praxair comes to mind. I would think most would deal. The problem is storing the stuff. It typically requires a vacuum Dewar which can be expensive and dangerous in the wrong hands. you might also be able to pull off the ice cream trick with dry ice, which can be stored for a day or two in a couple brown bags in a styrofoam container. read more

If you require very large volumes of high-purity liquid nitrogen or nitrogen gas our on-site cryogenic air separation plants are a viable supply source for you. Praxair non-cryogenic nitrogen plants offer a range of product purities, 90% and higher, over a wide range of volumes. read more

Because nitrogen gas occupies 700 times as much volume as the liquid, displacing oxygen, evaporation in confined spaces can lead to asphyxiation or explosions. Before purchasing or handling liquid nitrogen, it's important to know the proper safety precautions. Read about liquid nitrogen safety before purchasing a tank. read more