We make our own liquid AMS. Extra cost is whatever you value your own water source at per gallon.

I've spent years loading thousands of pounds of spray grade into inductors, just like many of you have also. Usually carried pallets of 51# bags on the tender. But, I will tell you that for me life is much better now that I can just watch the meter on a liquid pump put in the appropriate gallons (my computations) while I add other products. 

I have been "there" and back again. Spray life is better now. We tried to make it easier, and succeeded. Nothing hard about it. Another point....you can buy spray grade AMS in 2000# minibulk bags. I didn't invent this either. Information was handed to me last year here on AgTalk from another reader. Just let me say, you do have a choice.