The Stumptown aeropress video will give you an idea of using it while camping.
I pan roast and it makes pretty tasty coffee, but doesn’t work well as an espresso bean. For that I stick with something professionally done. I don’t think I would invest in roasting beyond what I’ve done. It’s a good way to understand more about the process/journey that beans undergo.
I got them on Amazon, the only place I could find them as well. However, I didn’t search as hard as you I think.