It doesn’t answer your specific question and isn’t meant to be preachy, just want to say that I’m shocked more people don’t use public libraries for books they don’t want to keep forever. Check it out as often as you want, no need to keep it on a shelf, if you really love it, then buy it.

Book outlet! They’re based in Thorold Ontario. They don’t have everything but I always check them first.

https://bookoutlet.ca/

Are there any local bookstores near you still? I’m an American and we still have a few Barnes & Noble around, but there’s also at least one independent local bookstore that has a decent selection of new titles and can order most other titles currently available from publishers. They regularly have events with authors on tour, so that could be a way to find a store near you.

If you want to support local book stores, you can use bookshop.org. not sure how that affiliate outside the US though

https://www.powells.com/

But you’re better off coming down to Portland and visiting the mothership in person.

Really surprised nobody has mentioned Better World Books yet. Good selection of books, most of the used books seem to be former library books, and they (at least claim) to donate books to charity with every purchase.

You can get really cool books for really cheap with their bargain bin sales too.

I’ve also tried ThriftBooks but I got too many bad copies - one book, Lord of the Flies, which was owned by a high schooler and had writing on every single page of the book and another book which clearly had urine of some kind on it judging by how obsessed my cat was with the yellow stain on the spine. Their edition picker is also terrible, very similar to the way Amazon handles their options to where different editions are all smashed into one page.

Well there’s always Indigo, they’re not much better than Amazon but they do have a comparable selection. If you’re in Toronto, BMV has decent prices and variety of books, mainly paperbacks editions though. They’re website isn’t mobile friendly so in-store is the way to go.

Secondsale.com has treated me well

I use www.ethicalbooksearch.com to find the best second hand options in the UK. You can change your location to Canada, for which they say they search Awesome Books, Better World Books, Biblio and ebooks.

I just want to let you know that abebooks is owned by Amazon.

Last book I bought online was from Wob. World of Books. I don’t think they are owned by Amazon.

Maybe Thriftbooks? They do offer shipping to Canada but it’s not always cheap.

Kobo isn’t bad.

Facebook marketplace for used books and used goods in general. Lots of good quality basically new stuff on there for cheap. I guess because so many Canadians just buy stuff without thinking and then it piles up and they need to make space.

Some neighbourhoods also have some boxes on posts (not sure what they’re called, they resemble mailboxes) where people can take and give away books for free as well.

You can also type ‘bookstores’ in google maps and seeing what local stores will come up.

Biblio is a solid but not perfect

AbeBooks. Usually better prices than Amazon, too.