Found this...

[jstoehr]

don't know if it's any good or not. You guys would know more.

http://shop.store.yahoo.com/safesand/ornatplaysan.html

[intrudah]

$ 50 for a 50lbs bag? IMO try locating SD in your area or go here

http://archive.reefcentral.com/forums/showthread.php?s=&threadid=263878

[GrendelPrime76]

i got my south down play sand for 5 bucks per 50lb bag

[TippyToeX]

And if you can not find south down go to these people Pure Caribbean Aragonite (http://www.purearagonite.com/). They have great prices and a nice to talk to.