The Courtyard Dunn Loring has been having $59 M11 rates but didnt find it on 3 dates I tried. Courtyard in Gaithersburg has a LPR for Realtor Relocation rate at $49 and they also are in the 50% off Entertainment card program.

Most of the Residence Inns are in the 50% off Entertainment direct with hotel as well, Herndon and Arlington listed.

With any special rate you would just want to check it in before 4 pm and that way if there is problem you just cancel the booking.

While a no-show would not work I imagine that there must be some owner of a Fairfield Inn or Town Place suites out there that would check-in a prepaid room for the night and then check it out in the morning. December is a tight month for many hotels.

You are probably in one of the least sensative market in the country though with all the gov. military and leisure stays to fill up hotels with.