Treehugger.com lists sources of free seed samples. Resources include Web forums, local seed exchanges, and Facebook seed swap groups. About.Com's Frugal Living has a list of links to companies and organizations offering free seeds.
Websites offering seed swaps include The Farmer's Almanac, National Gardening Association, and Garden Web. SeedLibrary.org offers a forum for local and online seed exchange. The site includes a list of local seed libraries. LiveMonarch.com and Prairie Moon Nursery offer free milkweed seeds for butterfly gardens. WinterSown.org provides free seeds and instructions to gardeners for starting winter crops.
Posting advertisements in community newspapers or contacting state cooperative extension services are alternatives to Internet sources. Local garden clubs may also hold seed exchanges.