Your best bet is to use Yarndex.com to find a yarn to substitue.
both solid and printed 80% merino/20% nylon wool
77 yds/50 gram ball - 80% merino wool / 20% nylon
Cameo shows off your stitches due to it's tubular structure.
Your cables and knit-purl stitch patterns never looked so good!
16 colors solid colors + 10 printed colors
3.5 - 4.5 sts/inch = 14-18 sts/10 cm
You can use the information on the Cameo yarn to search through yarndex. For example, here is a link to a list of all yarns that have a guage of 14 stitches per 4 inches, which is what Cameo is. Yarn with 14 stitches per 4 inches
If you still want to use Cameo but you can't get it locally just search on google - I was able to find these two stores that sell Cameo and will ship to Canada....
Yarn Market will ship internationally.
Jimmy Bean's Wool will also ship internationally.