Well I have eupatorium rugosum 'Chocolate'. It is not a deep purple but is colorful. It is only in its second year from seed. It looks like it will reach full hiegth this year. I can dig you some up. Let me know.
Kathy

Hi Doris, I have lots of purple plantain seedlings. I could bring you a whole flat of them if you would like. These grow very quickly. I have ajuga 'black scallop'. It's dark with purple highlights and blue flowers. LMK if you would like any. Karen

How about purple fringed loosestrife? http://davesgarden.com/pf/showimage/74272/

I should be seeing some Victor/Midnight Reiter seedlings showing up pretty soon.

Doris, I can bring you a small division of Acaena 'Purple Haze' if you like. Michele

Well, it's not deep purple, but I can bring a heuchera plum pudding for you.. it is burgandy on the underside. Susan (drtdgr)

OH Doris yoooo hoo...
I havent heard a response wether you wish to have the eupatorium rugosum 'Chocolate'. If you have time let me know today so I can dig it out for ya.
Kathy

Sorry, everyone, it's been a busy week! I'd love any of the above suggestions, if anyone has time to dig. If not, don't worry! Thanks everyone! See you tomorrow!