Ok. Now that I've had a cup of coffee ...
The last place I bought some cabling from was a place called Texcan. They seem to have all sorts of stuff related to wiring and cabling. I bet that they have what you need, but I'm not sure if you'd have to buy a whole spool or if they'll cut to order.
Here is their webpage you can look up their Calgary address and contact info:
www.texcan.com
If you still have trouble finding some, let me know. Because I can ask some of our wiring guys here at work. They were the ones that set me up with the other place that I got the 18awg solid-core from, I think I bought a spool of it for $20 (so not entirely unreasonable to buy the spool at that kind of price) -- it's just too bad that this one place (which was by Costco) is no longer in business or moved or something.