You can find EVERYTHING on eBay
You have to understand, we don't buy salt like regular people do. James has a thing about salt - well, about any kind of powder at all. He is always building scenes with his Thomas the Tank Engine toys, and if you watch these programs, you'll soon discover that one of the basic plot lines involves a train running into something or other - snow, dirt, coal, chocolate, hay...there's always SOMETHING. James's great joy is to re-create these scenes, and so any time he gets his hands on some kind of powder, it ends up dumped in a pile over a train track, with a train running into it. White powders are the best, because they can act as SNOW, so over the years I have lost countless pounds of salt, sugar, flour, powdered milk, baking powder, laundry soap, you name it, in the cause of dramatic train accident re-enactments.
The worst incident was back in Boston, when James dumped out a whole box of black pepper to run his trains through. He then got mad at Thomas for some reason, and started throwing pepper at him. Thomas, of course, retaliated, and soon I had both of them howling in pain because they had pepper in their eyes. They also kept throwing pepper at each other, because now they had PAIN to avenge! I was frantically trying to wash their faces off with a wet cloth, but Thomas was a little more pro-active, so he sought relief by washing his eyes in the first liquid he could get his hands on - a bottle of apple juice. So now we were in a sticky, peppery, noisy, crying mess, which continued until I hauled them both upstairs and put them in separate showers to clean off.
As a result of this debacle, we learned to adapt. I've switched to liquid laundry soap, for one thing. But the most effective tactic was to go over to single-serving packages. Now I buy envelopes of yeast, baking powder, and baking soda, instead of the boxes. Our dishwasher uses those cubes instead of the pourable powder. Sugar packets, envelopes of hot chocolate, office-style packets of coffee - we've got them all.
The only problem is salt. You cannot buy individual salt packets retail anywhere. Bulk Barn and Costco will sell sugar and sugar substitute, but I've searched in vain for salt or pepper. We could always surreptitiously bring home a few from McDonald's, but that's stealing, and I wanted to find a permanent, as well as honest solution. Finally I tracked down a restaurant supply company that also sells to the public, and got a big supply. But that was 4 years ago, and now we're down to our last half-bag, and the company I used before no longer stocks salt and pepper packets.
I was about to go searching the internet again, when I thought I'd look at eBay first. I never would have expected it, but somebody IS selling salt packets - 6000 US Food Services salt packets! How they got them, I don't know, but this should last us for a good number of years. Then I'll worry about finding more.