Most major resorts have a sign shop. Keystone has one in the mountain house village (and they might do all the work for breck as well I can't remember). Pay isn't that great, but you get to work every department on the mountain (hospitality, lifts, ski patrol, terrain park, maintenance etc), and because they have lower budgets and few employees they end up giving you a lot more responsibility as a designer/installer/salesperson. Plus its alot of fun, laid back and has a lot of variety.
My advice is pick a mountain/area you want to live in, then see what they have to offer. All major resorts have their available positions posted on their website. Or if you are excited about a specific department, track the number down and talk to them directly. They like ambitious people and they like resumes