Go to "www.helpgrowyourownsoup.com" and click on the red barn. This is a Campbells Soup website, you can click on the spade to donate seeds to FFA and then request a pack for seeds for your own home...all for free! There is a limit of one seed pack per household. You can go back everyday and click on the spade for the donation seeds.
I have never grown tomato plants from a seed, but for FREE I am willing to try.