I've never participated in Spa Week but it seems like a good deal. Running until the 21st, you can get full service treatments normally costing from $100 to $200 dollars for just $50 dollars.
http://www.spaweek.org/index.php
Participating spas are:
Cultura
Hela Spa
Jean Claude MedSpa
Piaf Salon and Day Spa
Red Door Spa - Washington
Relaxation On-Site
Soul Day Spa and Salon
Virginia
About Face Aesthetic Centers
Cassianna Day Spa
Jon'Ric International Salon &...
Modern Day Spa - Pentagon Cit...
Modern Day Spa - Tysons Corne...
Red Door Spa - Arlington
Red Door Spa - Fairfax
Red Door Spa - Reston
Red Door Spa - Vienna
Reflections of You Fairfax
Salon Cielo and Spa
Solarus Salon & Spa
The Medical Spa at Nova
Valon Salon & Day Spa
Maryland
Ashand Body & Spa
Avatar Salon & Wellness Spa
Red Door Spa - Bethesda
Red Door Spa - Gaithersburg
The Still Point