I looked last spring for about 2 months.. no luck.. the only type of sand that might be aragonite sold near here that I could find was Old castle brand.. you have to do the vinegar test on it.
There was some old castle that passed the vinegar test sold at a walmart up in Monroe MI... by the time I got up there they were out.
I did find old castle white play sand at K-mart, Walmart, and Meijers but it all failed the test... I tried each place multiple times to see if they got some aragonite in at different times..
If you are up for a drive, check out the cleveland area reef club-- there is a garden center near cleveland that sold Southdown last year... factor in your gas expense... if you aren't getting alot then its probably cheaper to get it online.. if getting a bunch then it might be worth it.