Sand question

[newgeek]

Hello, I have been lurking for a while now, I dont have enough eperience to start handing out advice I do enjoy reading it tho. I would like to say thanks to all who take the time to post so us new geeks can gather the info needed to be successful in the hobby. So thanks. Question - Where can a person get sand for a DSB in the city without buying live sand. I would like to keep this as inexpensive as possible. I have read about southdown and I dont think it is available in Calgary, What is everyone using?
Thanks Kelly.