Hey Matthew. I'm pretty sure I read on the John Sayers forum that Owens Corning doesn't sell 703 / 705 in Canada. Someone recommended Roxul RHT40 mineral wool as an alternative because it specs out pretty close, it's quite a bit cheaper and you can get it at Home Depot. I was actually going to do some acoustic treatment this week so I might try it out. Anyone else tried this?
Here's the website:
http://www.roxul.com/sw10392.asp
Craig.