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Great resources for those without a lot of cash for seeds —
The Dinner Garden is an organization that distributes seeds to those in need.
SNAP (food stamps) allows purchasing of vegetable seeds. Generally only available at your local grocery store, as most seed companies are not set up to accept food stamps at this time. But it's worth asking!
Dollar stores. Who would have thought? I'm not a huge patron of these places, but in the spring they carry very inexpensive seed packets (3 for a dollar), and they will take SNAP. As a bonus, most of the seeds I got from this supplier are open pollinated, not "designer" hybrids.
I prefer to use open pollinated, heirloom seeds if possible, as you can save them every year.
Other great resources —
• Johnny's Selected Seeds for an amazing selection and wonderful customer service
• Permies.com for permaculture information
• Cherrygal for inexpensive seeds in smaller quantities (I have not ordered from them myself, but plan on getting some of the herb seeds they carry
• The Survival Podcast is a great, common-sense podcast with lots of info about sustainability. I'm not a extreme prepper, but I've learned a lot about permaculture and storing food from this one. His approach is not the fearmongering, world coming-to-an-end thing many expect from the survival and prep community.