Okay so here is the deal that i've found thus far.
None of my home depot's in the area carry soutdown, oldcastle, or yardright tropical play sand. I called Home Depot Corporate and they show no record of every carrying it, Though they called and confirmed that Fredericksburg does in fact carry it. WEIRD
Lowes told me they would research the product, find it, and ship it to my local store - im still waiting on that.
I went to WAL-MART, i bout the orange and green bag. did the test and no fizz. the sku is 0538883418.
anyone have success with the walmart stuff? maybe im doing the vinegar thing wrong.