There is a Days Inn, La Quinta Inn, Fairfield Inn, Courtyard by Marriott. I know for sure these four offer a park-n-fly package. I have stayed at the Days Inn once and the LaQuinta Inn three times. I'm currently booked at the Fairfield Inn for my December trip.
Radisson is right on the airport grounds, i have stayed there many times. I have always got a good price on priceline but i would check there website. There is also a holiday inn too there. I have always parked on the airport lot for something like 6 a day.
Kim
We always stay at the Comfort Suites on Rockville Rd. VERY pleased with this place, nice breakfast & pool if you are interested in those things. Also clean. We did just use Marriott(last week) cause we had free points, that was also nice but rooms are better at CS. Have a nice time