Hi,
When we went to DC, we stayed at the Bethesda North marriott. We were flexible on our dates and only paid 89.00/night. It's right next to the Metro, so we were able to get in and out of DC easilly.
Here's the website to the hotel...
https://www.marriott.com/hotels/travel/wasbn-bethesda-north-marriott-hotel-and-conference-center/
P.S. Pardon the interuption..lol..long time member, but haven't posted in forever! This is the first post I stumbled upon