I eat a lot of pre cooked dehydrated beans. My favorite are Santa Fe Dehydrated Refried. Mother Earth and Harmony House are other good brans to get them from.
There was a similar post a couple months ago.
Best Products Sub $100 that you can get on amazon?!
Here was my submission, hopefully the links haven't changed.
Google led me to this Canadian online store: http://www.bridensolutions.ca/instant-refried-pinto-beans-nutristore-10-can
That's about twice as expensive as I pay on Amazon in the US: https://www.amazon.com/Santa-Fe-Bean-Southwestern-7-25-Ounce/dp/B000FI701Y
But 2x as expensive might be acceptable if you really really want beans.
You might also experiment with looking for instant bean soup, instant hummus, and instant falafel.
Couscous is a pretty solid base for cold-soaked meals as well, but it might not pack as much nutritional value as the beans, depending on how important that is to you.
Check your local health food store as well. You might get lucky in the bulk bins.