Hi!
I am currently looking in to camps myself. I found that Betterride is having one in Maryland, which is perhaps close for you? Price is higher but they have good reviews. You also may want to check AMC. Also, I am looking into Coyote Hill but they are in VT. Coyote Hill has a downhill camp which may be of interest to you, for your skill level.

http://www.betterride.net/mountainbikecampdates.html Better ride

http://www.coyotehillcamp.com/downhillcamp.html Coyote Hill