If you need liquid nitrogen to freeze brood for
hygienic behavior determination, you can transport it
in a coffee Thermos.  Sources of nitrogen include
industrial gas suppliers, beef and diary farmers who
perform artifical insemination and store bull semen in
nitrogen, dermatologists, and some family practice or
internal medicine physicians who use it to freeze skin
lesions, and researchers who use it for a variety of
purposes.

You can also transport liquid nitrogen for short
periods in a styrofoam coffee cup.  If the cup were to
break you could put yourself in danger as the cold
nitrogen will frostbite your skin.

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