Not sure what Showmaster is running here now - last I bought was $11 ish a bag, back in early March. We have our own custom ration mixed and pick it up at the co-op in bulk. A year ago it was $7.63 a hundred, now it's $13.55 a hundred, which is still not bad compared to most, I guess.
I should clarify though, that that's our base ration, and we always topdress with Moormans/Fast Forward 1 mineral, and often add beet pulp, fast fat, etc.... All those things add cost, too.