Danish modern (?) bookcase - $50

Giant Book Case - $50 (Columbia Heights)

Worth a look? Clearly, this picture is terrible. Unfortunately, so is the description... i.e. "I have this big book case thing for sell".  However, the style appears to be Danish modern and the design is fairly interesting. Definitely more interesting than your run of the mill bookcase. I'd guess that the compartment on the right center folds down into a secretary desk, and that the bottom has drawers on the left and a cabinet on the right.... but that is just a guess. If this isn't too far out of your way and is something you might be interested in, it is definitely worth a look. I'll bet the seller would take $30-40 for it - he/she seems anxious to get it off his/her hands.

http://washingtondc.craigslist.org/doc/fuo/1729095627.html

Modern bookcase / credenza combo

Solid wood hutch/bookcase - $100 (McLean)

This is a great looking credenza / bookcase combo that would add great storage and style to your home.  And this is a great deal - you are unlikely to find something of this size and style for anywhere near $100.  If you have the space and are looking for storage solutions, this is a great piece. 

There is no indication of the condition but it looks at least pretty good in the photo. Worth a look!