If you're not particular about the material (ie, most tobacco "tins" aren't metal - they're either plastic or waxed cardboard) - head over to snuson.com

It's a snus user board. They're always chatting about what to do with their empty containers.

If you're okay with plastic containers - you could very easily get a metric ton from those guys.

And - there are still a few brands that come in metal - but not many - and they aren't the popular brands/flavors - might get some though.