A little further south west, Sarnia. To be honest, it’s cheaper than London, but I don’t think by a lot. There’s also the option of living in Corunna, close to Sarnia, but even smaller and less expensive.

Here’s a semi recent article to give you an idea of the prices https://www.theobserver.ca/news/local-news/home-prices-conti...

The lake is nice in the summer and you’re close to Detroit for a weekend of cheap entertainment.

Good luck!