Low-sodium food stores
Bob, the major grocers carry some reduced sodium items like tuna and soups.
Loblaw's has many sodium reduced items in the Blue Label line.
Your Dr. can provide you with a diet information sheet and if you are having a lot of difficulty, a referral to a dietitian.
To get yourself off the salt habit get some of the Mrs. Dash seasonings and if you still have the cravings, a salt substitute that's also in the grocers' spice section.
Most importantly, adjust your taste threshold by avoiding processed and restaurant food while doing more home cooking. In about a week you will start to enjoy how food really tastes without the over-amplification of salt. You will find that a salty meal or snack resets your taste and you will need a few days to re-adjust.
Thanks, Foodie. I'm finding that everything you say about reducing salt content is true, especially about home cooking rather than takeout. Fortunately the lady in my life is a spectacular cook, and has adapted many recipes from her low-sodium cookbook to improve their tastiness. Already my taste buds are coming around, and if I ever tried a salty food now I'm sure it would taste strange. We've tried health food stores for low-salt items, but most of their wares are more concened with cholesterol than sodium content. We've found a few such stores (there's one at Beech and Queen in the Beaches), but we're looking for more.
If I'm not mistaken, a lot of Eden Organic products -- in particular canned tomatoes and beans -- are made with no added salt. Eden products are available at Whole Foods and other health food stores, and I think possibly even Loblaws (IIRC).
I find that, generally speaking, a lot of "healthy"/organic products are lower in sodium than mass-marketed products (eg. Kelloggs and Post cereals, which I don't even think of as high in sodium, contain a lot more salt than the smaller competitors if you look at the labels).
I also agree with everyone else that your best bet is just to avoid pre-prepared foods as much as possible (easier said than done, I know!).