Ive switched to hog feed as well. It saves me alot of time and money since I had to go to a local show for the lab blocks. My local farm and feed store carries it in 2 formulas. I get the one for growing hogs (younger hogs) for the higher protein content. I believe its 20 or 23%.
I just get the pelleted livestock bedding from the same store and have everything I need for less than $20.