Dan's deals has a post about this happening now...

Las Vegas-Baltimore dates:
12/04: $39.90
12/05: $39.90
12/06: $39.90
12/10: $39.90
12/11: $39.90
12/12: $39.90

http://www.dansdeals.com/archives/37120#more-37120

Snatch them before they get away! Wish I was still in Baltimore!