If a feed store doesn't have it on the shelves, make sure to ask the person in charge of ordering supplies, to see if they can get it for you on their next shipment. They sould be able to get it from their supplier. I finally found somewhere here in TN that is going to get me a 50# bag for $32 which is what I was paying for 10# online (because of shipping). They told me it's not something that they sell alot of so they don't order unless they have a special request to keep it from taking up space. I have to drive about an hour to get it but it still saves me lots of $$$$
Good Luck in your search!