It's hard to find at LFS's because it only comes from 1 supplier that I am aware of and there is a shipping charge for them to get it.
So the only economical way is to buy it by the pallet. Not too many LFS's are willing to stock up on that much sand at a time and have to pay a shipping charge on top of it.
People like it not only for it's looks, but it's a dry sand that does not need rinsing to get all the dust off it, it comes in clean already like the typical live sands do.