Try the custom AI to help you find products that Reddit loves.
Just import them from somewhere else. Amazon UK has them for £40 which is like $60 in our freedom dollars and probably like $80 of your icy Canadian hockey bucks.
Foreign amazon sites, especially the UK one, are my go-to when stuff is stupid expensive here. Just be sure you have a not region locked DVD player. One year when I was in college I even bought all of my textbooks from Amazon.co.uk. Even with shipping fees it was cheaper than the stupid university bookstore, it just took a few weeks for the slow ass shipping.
I just went to Amazon, typed in "Lost complete series" and got this as the first result: Here
It wasn't any harder. And it's also region 2 (Europe).
There's also a blu-ray version.
Check out these Amazon reviews