Sources for older, but not classic, cars

I hate modern cars. They're too expensive, even as used cars. They're too
gadgety. They're too complicated to work on, which makes them too time-
consuming to work on, and at today's labour rates, that's a non-starter for
me.
And they're UGLY! In short, modern cars suck!
When I retire later this year and I am no longer driving 600 kilometers a
week, gas mileage will not be such a concern, so I've decided that my next
3-season daily driver will be a mid-size or full-size, rear-wheel-drive Ford or
GM from the late '70s to the mid-'80s.
But what is a good source to find such cars for purchase in or near eastern
Ontario?