I just bought 40# for $12.95 at Big R, the west coast equivalent of TSC. Took a little work to find someone who actually knew what I wanted, but there it was, sitting on the shelf next to the wild bird seed...??
Actually they have Big R stores here in the midwest too. In fact, I moved here from California but I had never heard of or seen Big R until I moved to Indiana. Unfortunately the Big R near us closed a few years ago but there is one an hour or so away. For us, TSC is also about an hour away. We do have a Rural King but I don't go there.