Hotels.com:

4th of July promo: Free nights and $25/$50/$75 MasterCard gift cards. Offers vary by participating properties. [book by 7/4, stay 7/1-7/8]
Book by July 4, 2009 for travel between July 1 - 8, 2009. *Sale on participating properties only. Minimum night stay required. You will receive the value of a free night when you book the required number of nights at a participating hotel. For example, when you book four nights at a participating hotel that requires a 4-night stay, you will receive 25% off of your entire stay, which is the same as receiving a free night. Offers vary by property. Rooms and prices are subject to availability. Prices do not include taxes and fees and are subject to change without notice. Additional restrictions and blackout dates may apply.
$25 prepaid MasterCard® card offer valid on new bookings of 2 nights, $50 prepaid MasterCard® card offer valid on new bookings of 3 nights, and $75 prepaid MasterCard® card offer valid on new bookings of 4+ nights. All bookings must be of consecutive-night stays at the same Price Match Guarantee hotel, made by July 4, 2009, with travel completed by September 15, 2009. Prepaid card is valid at any merchant who accepts MasterCard® prepaid debit cards.

Reminder:
Hotels.com Last-Minute Deals list is updated every Thursday. This and (every) Tuesday's 24hr sales may help with BRGs if you file early in the day.