Here are several websites that advertise used ballgowns. Shop away!
Ballroom Dancers Classified Section
Dancescape's Classifieds
Dancesport Exchange
Dancesport UK Classifieds
The Ballroom Gown Network
Shirley Massey/Dancer Designs
Dancesport Image
(SF Bay area only)
Glamour Gear
(UK)
Dance Plaza Dress Shop
(Netherlands)
Dance Vision Classifieds
Ecosse Dancewear
(UK)
Box Step
Chrisanne Ready to Wear
Choice of London