Don't think many of these stay in stores for long, if anything they are sold A.S.A.P.
Might have to find a retailer to import them for you with a deposit. I know some retailers here do special imports.
You could try contacting some of the dealers here..
http://polarstarairsoft.com/dealers (Canada)
Edit:
Can try contacting these guys?
http://www.tbdairsoft.com/product_p/pr15-145-tac.htm
http://www.imperialairsoft.com/pr-15...l-carbine.html