You used to be able to get Southdown from HD/Lowe's. I'm not sure if they carry it anymore or not. You can go into your local HD/Lowe's and ask for it, if they have none, have them contact other stores in the region and see if they have any that you can pick up or have shipped to you. Its much cheaper then the LFS sand, and just as effective. If you can't get nay, likely not these days, best just to look for a fellow reefer breaking down a tank or head to the LFS and lay out the cash.