Cheaptickets:

Promo code: CHEAPSKATE for 20% off hotels
Minimum stay: 2 or more nights
Book by May 3, 2015, travel between April 27 and September 30, 2015.

Limit one discount per hotel room and one promotion code per booking and up to a maximum savings of $500 per booking. Discount may not be used toward the booking of a vacation package. Most major chains are excluded, to find participating hotels look for "PROMO CODE ELIGIBLE" message.