Found this one on Amazon relatively cheap with a quick search for transfer Dewar. Being new it should be clean, maybe give it a rinse with clean water. I would recommend getting a cooler with some ice, or dry ice would be better, put your transfer dewar with the liquid nitrogen in the cooler (leave the cooler cracked open for venting) and drive home to make your ice cream, etc. A good transfer dewar can store liquid nitrogen all day if covered with the foam cap, but the dry ice will prevent too much boil off during the transportation process