Where do you find used oscilloscopes?

Or rather “Where do you find really cheap used oscilloscopes?”

Brockville isn’t exactly a surplus electronics mecca, much less a surplus metering equipment mecca, so I’m not sure where to focus my search.

My fallback is a USB-dependent model from China, somewhere in the $50-$100 range.  I’ve been told that old-school CRT versions are best, but you can’t exactly order those for less than $100… or so I’ve found.

Does anyone have a suggestion?