I was looking at the choices in Walmart. As expected, many shelf stable foods are VERY salty with the exception of the plain rice.

Is there a tabulation of prepared foods in which the amount of salt is NOT listed in terms of %RDA which I don't find a useful measure but rather mg NaCl / 2000 kcal ?

The amount of salt 30-50% RDA is tremendously high for a mere 200-300 kcal serving. While the taste of what I tried was OK, I found it overwhelmingly salty to taste.

If the container had 2000 kcal, the same 30-50% RDA sodium would be not a big deal.

Given that the bulk of calories can be carbohydrate based, pasta or rice, even 100% RDA sodium in 1000 kcal serving wouldn't be a big deal.