I found a great deal on Amazon for Cummins CC36154-6PK FluidPOWER HD Antifreeze/Coolant Concentrate - 1 gallon (Pack of 6) $83.69. Two cases to Anchorage for $167.38
This is the same as ES Compleat™ OAT, just repackaged by Cummins. I got this information from the Cummins dealer in Anchorage.
http://www.amazon.com/gp/offer-listing/B00WQWK88Y/ref=oh_aui_bia_olp?ie=UTF8&condition=all
For some reason every time I shop for this stuff, I can find premixed Fleetguard ES Compleat OAT coolant at Kenworth dealers for $12-$13/gallon. The cummins dealer across the street will have the same cooling for $20+/gallon. I particularly like buying this because I don't have to fuss with gallons and gallons of distilled water and mixing. It *really* pays to call around for this stuff.
Premix is convenient when topping off, but it is costly when trying to achieve a 50/50 mix after an engine flush. The Anchorage Cummins dealer has the FluidPOWER HD Antifreeze/Coolant Concentrate for $21/gallon.