https://www.boundtree.com/IV-Drug-Delivery/IV-Warmers/Thermal-Angel-Standard-Emergency-Pack/p/TA-SEP

$1659 and the warmer is one time use, so if you need to administer another bag you burn another thermal angel unit. also the power supply only powers one thermal angel at a time for this price. However it does regulate the fluids meaning once heated it maintains that temp.

Iv Fluid bag warmer, it DOES warm the bags, however as soon as they leave the heater the temp is dropping and no longer regulated. Essentially it is a pelican case with 12v heater built in, no battery options or 110 v on this one.  This costs $859

https://www.boundtree.com/IV-Drug-Delivery/IV-Warmers/PAK2-P-IV-Fluid-Warmer-with-12V-DC-Cord-Set/p/1870-11216

I think we can do better :)