Here's a few things to try for Camden
KA92911 - Camden, Town of
153.9200 B/M
154.0850 B/M
156.0000 B/M (PD input?)
I didn't find a National Ski Patrol license for Camden, but here are the other ones for Maine that came up. For the most part, it seems that Ski Patrol uses a lot of the same freqs nationwide. Since Camden is fairly small, they may only use portables and be covered by a nationwide mobile license so try all the freqs below.
KMB207 - Ski Patrol, Sugarloaf
155.1750 B/M
155.2200 B/M
155.3400 M
WNIX699 - Ski Patrol, Lost Valley (Auburn)
155.2200 B/M
155.2650 B/M
155.3400 B/M
WRA278 - Ski Patrol, Evergreen Valley (Stoneham)
155.1750 B/M
155.2200 B/M
155.3400 M
WYZ261 - Ski Patrol, Saddleback
155.2200 B/M
155.2350 B/M
155.3400 B/M
Also try:
155.1600
155.2050
155.2800
155.2950