Hi! Great forum because I was so confused by the difference between what material is what between hoop makers in different countries. It's been a great learning experience.
I have also found as Spin Doctor says tubing at Home Depot - if it is helpful to others identifying this tubing, it is PE tubing (they also have superpex which is more expensive). My search for Polypro locally in Canada finally happened by accident recently at LOWES.
Lowes has 400ft of black PolyPro - 1"OD 3/4" ID for $89.98. That's going to make a LOT of hoops, but I'm preparing for a show so good deal if you're doing that. I have used the PE tubing at Home Depot, Rona and Canadian tire but I think I am liking the way the Polypro at Lowes best.
I ordered clear Polypro from www.plastictubingonline.com in Alberta, and the only issue I am having is that the tubing is tightly wound into a small diameter and it does not seem to want to "relax" into a 36-40" hoop. It will make great minis though.
I buy the 3" long barbed grey connectors at any of the big box hardware stores, and I find that using my tube cutters to take off the last "barb" and make them 2.5" long works fine and reduces the "flat spot" on the hoop. I use my dremmel moto tool with a sanding wheel to quickly remove the middle bump (wear protective eyewear and clothing as flying bits of plastic are hot on the skin).
Polypro at Lowes!? Thank you for this very useful bit of information!