Depending how much you want, and how many sand crabs (children) you have, it may be easier & cheaper to call a landscaping outfit (Sand & Gravel) and have a few yards delivered.For those who use sand, what kind do you get? I found THIS but don't know if it will work well in the run. It's the cheapest too. Others are $3.75 for a 50lb bag but this one is 3.25 for a 60lb bag.
They can dump it in your driveway, and you wheel barrel it whereever you want.
This includes pea gravel & assorted barks.
Go look at it before you buy it so it is the product that you want.