You can buy them on line: google "sprouting seeds for sale". When you google "sprouting seeds", you can get some ideas for sprouting containers you can make or buy, and also get an idea what kinds of seeds are safe to sprout. You can buy seeds at your local health food store. You might be able to sprout whole lentils that you buy at the grocery store. I may try growing broccoli to set seeds next summer. Given the amount of flowers produced on a single head of broccoli, they should be prolific producers.