Get a bag of black beans and cook them in the crock pot. Cook some Spanish rice (also easy and cheap. I use brown rice, it's healthier). Rice and beans together are so healthy! My family likes these with quesadillas, inside burritos, or just plain for lunch :)
dry beans goes a long ways..... I like big butter beans. Soak em then throw em in a pan on the stove. During the last 15 minutes take flaky canned biscuits and peel them apart drop them in the beans and let em plump up like dumplings. Sooo good!