Can't speak from experience so not sure how helpful these are but my search shows some options you can consider if interested:
• Some LCBO carry these, check availability near you - Burdock Brewery "Triple Ducks" 10%; Spearhead Brewing Co Big Kahuna Imperial IPA 10%; Walkerville Brewery Imperial Stout 10%; Nickel Brook Kentucky Imperial Stout 12%
• In Barrie - Divinity Barrel-Aged Barleywine 17% - Flying Monkeys Craft Brewery
• In Ottawa - Between Two Evils Barrel Aged Imperial Stout 10% - from Dominion City Brewing
• In Toronto - TDWDTG Mole Stout 13% - from Blood Brothers Brewing
• In Milton - Imperial Stout 11.9% - from Third Moon Brewing
All the best!