I've done the same search and there's not many sporting clays courses in Ontario. Closest for you is the Galt Sportsman's Club. Next is probably the Oshawa Skeet and Gun Club - both clubs have very nice, fully automated sporting clays courses and host a few NSCA registered events each season. Uxbridge apparently has a SC course as well, but I've never been there - their website describes it as "self pull" but don't know if that means manual traps or not. We have a small 50 bird SC course here in Kingston, but it's all manual traps and there is no trap boy this year so it seldom operates. Once you cross into the US there are more options, if you're willing to drive or want to plan a SC vacation and hit a few different clubs.