Similar situation here. I requested training through Gambro/Baxter on several occasions but it's still not something they provide. Barkey will provide a course, though it is in Germany and costs around 1000euro for the half day session. You then have the purchase of the calibration kit, for around 2500euro, to consider. Annual calibration of service kit is around 150euro.
I've often thought if it would be worthwhile pursuing getting Barkey over to run a course, if there was enough interest. We have 11 warmers so would still work out as a cost saving over the life of the equipment.
Haven't looked into alternatives, sorry.