We've always bought ours from either, the tractor place (have no idea what the technical term would be

) or PAH , We have always had to order it in at PAH or reserve the limited sacks they get of it, went in 2 weeks ago and they said they were no longer going to stock it as the "classic" version is to be discontinued.. I did ask if it was just PAH that were classing it as discontinued but they said that is the info. they received from the manufacturer.