I have bought one tank through ABS, one tank on EBAY from MVE and the other from a private person. The best tank has been the MVE from EBAY. The second one has been the one from private buyer. The tank from ABS evaporates. Is suppose to be a 120 weeks but I have to fill every 60 days. Caution when buying tanks.
I would check out on clubcalves.com the tanks they have for sale there. They also offer theirs on EBay. Bovine Elite offers equipment as well as genetic horizons. I use a thermos to thaw with a thermometer.