I've tried several of the Park City, Utah resorts without success (although I could usually count on a discount at the same resorts in my pax airline days).

Several (maybe more than several?) of the local ski shops between Salt Lake City and Park City have discounted lift tickets available for purchase at their shops. Of course you'll have to do that on your way to the slopes. There used to be a ski shop in the baggage claim area at the SLC airport that had the discount tickets.