phin
Aquarium Advice FINatic
I got mine at tractor supply co. I'm sure you could find some at Home Depot, lowes, or other places like that too. It's really cheap, I got a 50 lb bag of it for under $10 and that was more than enough to do my 56 gallon, a 5 gallon, and to add to the sand bed in my 30 gallon. I still have about half the bag. You just have to be sure to rinse it really well, because it is really really dusty.
I use the black diamond blasting "sand" for sand blasing. They don't have it at lowes or HD (must be special ordered). tractor supply has it on hand.