Soy sauce shouldn't be too hard for people to find. The grocery stores here in Beattyville, a very small town in the hills of Kentucky, carry soy sauce. So I imagine that you can buy it about anywhere.
I have not met a grocery store yet that didn't have soy sauce. It's pretty much a staple. I bought a large bottle of it at Sam's Club. We use it and vinagar to season meat when we barbeque instead of salt. I'm sure it has a lot of sodium in it though.
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