Live-out Nannies will be more expensive. If you are okay with live-in nannies you can always hire one from overseas
http://www.cic.gc.ca/english/work/ap...-caregiver.asp
There is a bit to do to get them over and the process will take several months but in the end the cost would be less than a live-out nanny and you wouldn't have to worry about them getting there in the morning.
There are several companies that will help you find and bring over nannies from overseas as well
http://www.nannyconnection.ca/