State Parks are usually inexpensive - Cooper's Rock State Forest is close to Cumberland or how about Savage River Lodge, just outside Frostburg, Wisp Ski Resort or one of the rental homes in that area. Going in the opposite direction, Berkeley Springs, WV has Cacapon State Park Resort, there are also B & B's and rental homes here as well. No waiting period in WV!
Check out Frostburg State University's Lane Center. Had my reception there in 2008 & my brother in law had both his wedding & reception there last year & it was great! Food was amazing, service was great, & price very reasonable! They have a whole team to work with you that accommodates all the catering, the decorations, linens to match your wedding colors, & provides the changing rooms beforehand. They can hold both large weddings & smaller weddings :) Your guests can stay at i think the best western a few miles away & you can set up a shuttle van with Frostburg. Good luck!