I will verify octanes and prices, but Keith's Sunoco on Indianola Avenue just South of Cooke Road has race fuel. I know they have 110 and 116, they mentioned one other but I can't remember I would assume 100. They said they are competitive if not cheaper than Valero on Hamilton road.
Sign on the front confirms they have it, just go in and ask. They asked me to spread the word. I will start a thread with verified octanes and prices in the next couple of days!