I found condensed milk! It was in the Thai food section of the grocery store and I had to pay $4 for a small can, but at this point... The supermarket did have about 8 different kinds of evaporated milk in cans -- nonfat, 2%, house brand, Carnation, etc. -- and priced reasonably at about $2 a can, but condensed was exotic apparently.
Another thing that surprised me about Toronto was turkey. In the states, turkey parts and ground turkey have become ubiquitous and I'd developed quite a few recipes based on cheap ground turkey. The supermarkets in the downtown area here very occasionally have it -- very occasionally -- but it's an arm and a leg, price-wise.
On the other hand, every market, even the questionable corner ones, have 3-6 year old cheddar that is just outstanding and very reasonably priced.
It's true about the turkey and it's delightfully true about the wonderful cheddar.
I cannot imagine where you are shopping that you can't find condensed milk and that you pay so much for it. I currently have in my stock three kinds: Perfection, Eagle and one more: Compliments which is a brand carried by FreshCo, Sobey's and Foodland. There can't be a grocery store in Peterborough (90 miles east and somewhat north of Toronto) which doesn't carry condensed milk. In the baking section. I am floored by your nearly fruitless search.