Ebay is a very good option. I bought some lab equipment off ebay when I was starting my lab
http://www.ebay.com/itm/Professional...item1c280802cd
If you know someone in a research lab at the UofC or a government lab, then Fisher Scientific Canada or VWR maybe an option. They are kinda on the low end for research labs, but for home use and teaching your child, they will have more than what you need. You need the connection in order to get contract pricing, otherwise the prices are over inflated