I know that Home Depot and Princess Auto carry pinch and ear clamps. I don't think they're Oetiker brand but should work nonetheless. I'm also not sure on the size ranges they carry.
There's also a place in Mississauga on Dixie just north of the 401, on the east side. They're called Cisco Industrial Sales. They deal a lot with hydraulics among other things. They have a large store with shelves and shelves full of parts. I'd bet they would have Oetiker or similar clamps in stock and probably in the size range you'd need as well. It would be worth giving them a try.
I had some recent work done on my car where they had to remove/replace some lines and the one-time use clamps had to be removed. They were put back together with gear clamps, and I hate them. Yes they do the job just fine but they're terrible to look at. I was considering replacing them all with t-bolt clamps. Trick is to find them with thin enough bands. All the ones I find have 3/4" wide bands and I'd like to find them with at least 1/2" or 3/8" wide bands. That may be another option you'd be interested in.
Good luck!
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