Milkweed/Asclepias seeds?

Hello...

I am looking for any Asclepias seeds OTHER THAN from these species... can anyone help me out?

Asclepias asperula
Asclepias curassavica
Asclepias exaltata
Asclepias incarnata
Asclepias purpurascens
Asclepias speciosa
Asclepias syriaca
Asclepias tuberosa

Those are the ones I have... other than that, I'd be interested in any other types.

Thanks in advance!
God bless,
Jeff

I've bought from these two nurseries before and was pleased-
http://www.butterflyencounters.com/store/products.php
http://www.milkweedfarm.com/

I saw Swan Plant (Asclepias fruticosa) for the first time this year and thought it had the neatest seedpods ever, inflated to the size of a tennis ball, but with spines! Saw a monarch cat on it also, pleasantly surprised. The plant is tall and the flowers dangle.

google prairie moon nursery--I can't remember all the species they had but I was looking for some other native plqant seeds and stumbled on them--they specialize in native seeds for "up north". =)
Debbie