First of all, many of the MPs, independent escorts and agencies haven't quite stepped into the 21 century yet with an online presence. Just another sign of the backwards-ass mentality displayed by far too many citizens of this fair city.
Also, if past information posted here is correct, most of those agencies listed in the Yellow Pages are all the same company with different names but the same receptionists and SP, and apparently they are prone to using bait-and-switch tactics.
Here's an agency that advertised in SEE a short while ago, which includes at least one familiar face:
http://www.intimate-occasion.com/
Here's another that was posted in the Escort 411 forum recently:
http://www.escort-locator.com/
There are some other escort listings and search engines you can use, such as Red Zone. If you do some research, you'll find them posted in threads here, or in the SP Directory and Advertisers sections on this site. You may discover that some of these escorts who are based in Vancouver and Toronto do tour other cities across Canada. Or you can always contact one that catches your eye and inquire about travelling arrangements.
You can also do a search on Google and you may luck out on finding some local or visiting SPs the rest of us don't know about.