This is just my opinion, but if you can't find it I would just set up the tank "barebottom for the time being. Add the sand later.
The scuttle-butt on RC was that the Fort Pierce Mining Co (the people who packaged the tropical play sand) went toes up. Marco (Fishy Business) was having a hard time tracking down some for a group order. He was being told that it was discontinued. Moe, on the other hand, is convinced it will resurface in HD come March.
Apparently, all is pretty much true. Some guy on RC was selling 40lb bags of something he was calling southdown just recently. Some people were skeptical, but bought it anyway. I think he got $25 including shipping per bag.
Anyway, since it was 40lbs, some thought it wasn't the correct stuff. Apparently it is, and the 10lb decrease per bag had something to do with the restructuring of the company.
Who knows, but there is some form of the stuff out in circulation, somewhere.... It may take a while to find it's way back into major circulation, though. Or, Moe may be right, and this is the usualy winter panic over a lack of the stuff, and come March it'll be in every HD on the eastern seaboard.
So, set the tank up barebottom....add the sand later.
JMHO.
-Linda