I got it at a place called scp which is a swimming pool supply for pool plastering and service companies. You can also find it at national pool tile. They are combined where I'm at in sacramento but might be called one or the other where you live. If they won't sell to you you could ask a swimming pool plaster company or service company if they can buy it for you. Reason being scp and npt are wholesale and usually don't sell to the public. A little more work to get the stuff but I think it's worth it. Never used the tractor supply blasting sand but a lot of people use it and seem to like it.
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