im not sure if anyone in the states does this and honestly never ran into a provider that did but, my local meat supplier. small guy. in addition to making and smoking their own stuff makes and stock from beef. veal, chicken, and moose/reindeer. it is reduced to a thick gel and you reconstitute at 3 to 1. No salt at all, plain stock concentrate. quite expenssive but then again it is a top quality product. check with small, local meat providers as that may be an option.