Thats hard to believe, thats common stuff everywhere. An option can be to order it from them and theyll have it in a couple of days. Use the grey electrical sch40 for the pipe. Its 60% cheaper and is UV resistant to boot.Home depot have nothing in PVC, only CPVC which are different sizes. Oddly enough though they do sell 10' lengths of the sch 40 1/2" pipe.
You could go the aluminum route from Metal Supermarkets. But then youll have to get approx 10 gauge aluminum for the phasing lines. You dont want to mix metals.6 or 8 ga copper wire
It looks perfectly legal for cold water (same as here), from this Ontario code : http://www.3dplumbing.net/ontplumbing/plastic_pipe.htm#support_plastic_water_pipeI wonder if it's something that isn't required for our codes in Ontario and that's why the stores don't bother.