I don't know how you have so many seeds (lentils, peas, beans, radish, sunflower, broccoli). Let's assume you bought a boat load of seeds for your garden and didn't get to plant most of them. Have you considered growing sprouts; like "alfalfa sprouts"? They would be a good substitution or addition to lettuce in your salads. And cheap!
Here's a link to some information, you don't neccessarily have to *buy* their supplies.