I have just found this. Free seeds for members of Suttons Seeds. Hopefully you will be able to get some.
UK Free Seeds
http://www.nvsuk.org.uk/news/nvs_news_item.php?item=10
http://www.squarefootgardening.co.uk...iles/page6.htm
http://www.plantforlife.info/pages/register.asp
USA Free Seeds
http://www.freeplants.com/
http://www.livemonarch.com/free-milkweed-seeds.htm
http://www.greatsunflower.org/