Buy an instapot pressure cooker and get some dried beans of all varieties. Pair the beans with rice and you have a complete protein! I am in romantic love with my pressure cooker. I'd recommend making chili in it right off the bat. (You'll need diced tomatoes, beans, onion, chipotle peppers and chili or taco seasoning. Split pea soup is also stupid easy and very affordable.
You can also get a seed sprouter and the seeds for it for some produce in your diet. I also like sprouting mungbeans. And it's getting a little late in the season to plant I think but consider starting a tomato plant.
I usually get these from Amazon. Price is ok, quality if very good. Palouse 5lb bag.