Texsport is the one

Despite trying more expensive cast-iron Dutch ovens, which do indeed have their charms and are of high quality, I find that my favorite (at least for now) is the Texsport 2-quart cast-iron Dutch oven, which you can find for less than $20. It’s not enameled, but that has not been a problem. It’s actually slightly larger than 2 quarts, which I like because it better accommodates cooking leafy greens in a GOPM. And since I carefully measure the starch and the protein, the extra room is devoted solely to vegetables. Also, the shape of the Texsport—a taller, narrower cylinder than most—works quite well for this kind of cooking.

So if you going to get into GOPM cooking, and the 2-meal size of pot works in your situation, this is the one I would recommend.