Who sells sinking catfish food for the winter months?

One of my local Coop's keeps it in stock (Producers in Girard). Not sure about winter time, but any other time I have ask for it. Most other places keep just the floating. Even other Coop's in the area.

It is funny because at their "store" they only keep the floating on hand. I have to go to the elevator/feed mill to get the sinking. It comes in pellets that look like pig feed or the Skrettings feed rather than the round pellets like most of the floating food.

Wonder if I could just feed some cattle range cubes in the winter? They sink and would provide some food value at 20% protein. Stores around here don't have sinking catfish pellets.