I don't live there (although I've visited my dad and sister there a few times lately), so I can only give you the information I've found online: Here is a listing of AIS Region 4 (Maryland, District of Columbia, Virginia, West Virginia, and North Carolina) clubs.

Also, Carol Warner is listed as the president of the Francis Scott Key Iris Society and you can contact her on her site: Draycott Gardens. She introduces pseudata iris for Hiroshi Shimizu of Japan.

Anita Moran is very active in the iris world and is also located in MD/is a member of FSKIS. She has a site as well: Pilmore Gardens.

Hopefully, one of those leads will help you find some sales. :)