I really don’t know how much sand I have. It’s bigger than a bread box!! I had a 24 foot pool that we removed and installed a 13 foot in a better location and it had several inches under it. When we installed the 13 foot pool we used a pool liner on the bare ground and put about 1-1/2 to 2” of the mason sand on top before adding the pool.
I know I put about 5 pickup truck loads of sand under the 24 foot pool. So I would say a minimal of 3 55gal drums of sand are under the 13 foot pool.
As for price well… play sand goes for what $3.50 at 50# and it should fill up a 5gal bucket, right? So say like $2.00 a 5gal bucket. If you want all of it makes me an offer. Also would do great in a child’s sand box.