I swear I'm not trying to give this shop a plug, but Village SKis and Bikes (Lake RIdge/Woodbridge, VA) tells me that they have Timberline lift tickets for $10 off the normal price.

I did a season-long lease of equipment for my daughter from Village Skis, and with that I received 2 free adult (weekend)lift-tickets to Hidden Valley. They tell me that any leased or purchased package include the Hidden Valley lift tickets.

If I'm not mistaken I think they also have a shop in Burke, but I'm not certain.