I am getting my first really good flowering this season from my purple milkweed, and if I get good seed, I will be happy to share some, no charge. I like it a lot because it is much better behaved than common milkweed -- it forms a nice full clump but does not spread -- and it has gorgeous blossoms. What's more, it seems more attractive to egg-laying females than any other variety I have. Keep in touch, and I will let you know when or if I get seed pods.
I also grow swan plant as an annual, and it always attracts comment.