Like I said, not your traditional dance cards, but greetings cards for those addicted dance fans out there!
Ballroom Cards.com via Dancing in the UK, is an exclusive online store for dance greetings cards, celebrating the beauty of dance. And if you order online by 3pm it's same day despatch for all cards in stock! They stock all styles of dance cards, including Latin, Tango and Ballet as well as traditional ballroom.
As an added bonus, they will actually produce cards for artists and photographers, so if you've some great dance images and think they would sell well as a card, get in contact with them and see if you can work something out!