RMC is increasing the non member overnight fees for their facilities on the slopes of Mt Adams in the Whites. The Perch is popular legal overnight site used by AT thru hikers when doing the long above treeline stretch. The new price for the Perch is $15 a night for non members. I do not know if there is work for stay option. Do note its cash only. Recent club comments is they are having a large number of folks showing up claiming to have no cash and stiffing the club by not sending the cash owed afterwards. RMC is run by volunteers with the only paid folks are the seasonal caretakers and the trail crew. The management are all volunteers and the club doesn't have deep pockets.
http://www.randolphmountainclub.org/...rshelters.html
The woods along the treeline are dense spruce/fir with no real option but to stay at the shelter site.