We have a local milling company that makes it here.. and it’s cheaper than TSC.One of the issues I have with low calcium and low protein feed is that it's hard to get both, from my supplier the only low protein feeds are egg laying feeds. I do wish someone other than Dumor would make a 15% protein feed without calcium in it... if I shop around I might find it.
Have you thought about cutting the high protein low calcium stuff with a scratch of some kind... as I recall they are around 9% protein and cheaper.. I would not recommend that with birds that will be around for years, but CX have a couple months is all.