Wanted: Wanted: new boxes or flats of 12ga or 20ga shotgun shell slugs for range & target practice

I'm looking for new boxes or flats of 12 gauge or 20 gauge shotgun shell slugs (rifles or unrifled) that are 2 3⁄4" / 3" / 3 1⁄2".

They are mostly for target practice at the range and not for hunting so I'm not looking for anything fancy or expensive ideally.

If you have older ones that have been laying around for a while,  I'm fine with that as well - as long as they are in good shape and not corroded or broken.

I have a lot of extra boxes of 12 gauge shotgun shells that are various shot sizes (both lead and steel and ranging in sizes from BB all the way to about #6) that I am willing to use to trade if that is something you would be interested in.  You can see my other posts for what I have up now but I do have more not yet posted.

I'm located in Laval (next to Montreal in Quebec) and so unless you are willing to ship I would prefer keeping it fairly local (say 30-45 min away) .