Not Certified for Human Biologicals
Do not ship products in any of these tanks except the CT-3D Vapor Nitrogen Shipper Tank. If they tip over in shipment the LN2 spills out and your product will thaw and ruin.
Where to Buy Liquid Nitrogen
OK, so you now have a liquid nitrogen tank. Where do you get the LN2 to fill it with?
Most people use a local distributor for one of the large bull semen companies, like ABS or SelectSires, who runs a route and comes by your place and refills your tank on a regular basis. You can contact either company to find their local distributor.
You can also buy it from one of the national gas distributors like Airgas or Praxair but you will probably have to pick it up at their plant and the minimum amount could be more than you need.