I cant find any grade of pure silica sand where I live. I have been everywhere looking.
It can be found at eBay and the bag of sand its self is pretty cheap, but the shipping is a killer!!
It's over $30 just to ship, but it is 50lb's, so I guess the high shipping is to be expected.
It is pool filter sand. I have also seen silica sand sold in smaller quantities for use as a paint additive
for boat decks.
It is sold at boating supply places in 2 and 5lb containers, which is ideal size and it's pretty cheap.
I will find and post a link, maybe someone has used this stuff.
Found this on eBay, 1lb bags:
Looks interesting.
http://cgi.ebay.com/SILICA-SAND-ONE-POU ... 3cbab502f1