You just have to ask your butcher or deli operator to read the contents labels and see if salt is a major ingredient, or even included at all.
Your other alternative is to get a boneless beef roast and smoke your own. There's no recipe to it. Just low-heat smoke it for a day. It's just like making a BBQ brisket, low and slow - but almost a cold smoke.
"Food is our common ground, a universal experience." - James Beard