I open all of mine cause I want to create a sort of uncut sheet of one card from 56 different decks but I know some people just keep them sealed for resale.

Hi Tyl3r
Where in Canada are you located?
We don't buy much anymore so hard to answer your question.
We find if we buy something stateside it's easier to ship to daughter in NYC.

Good country Tyl3r - welcome and enjoy it here. You'll find the people friendly and helpful.

Welcome to the Discourse, Tyler.  It's nice to see that you aren't afraid to ask questions!

What all that boils down to is you would need to find an old deck design that is no longer protected under copyright or trademark law.  They're few and far between, but not impossible to find.  Then you also have to get your printer to agree to make it - for example, if USPC didn't want you to copy an old USPC design, they certainly wouldn't let you print it in their printing facility!  Some smaller facilities may also not be interested just because of the legal hoops they may have to jump through if USPC tried defending their work under trademark or copyright law.

Your best bet would be to find designs from a company that's defunct - not simply purchased by another company, but went out of business.  They must also not have sold off the intellectual property rights to another company.  There are a handful of companies that fit the description, but you'd have to do a good deal of research.  Then there would be no one to make claim to having any rights to the design.