Those racks that go on top of your car that hold skis and Snowboards, how much do they cost?
Ballpark cost for a full rack (meaning you have no factory roof racks at all) will run you about $350 to start. The Foot Packs are about $140, the Fit Kits start around $50, Load Bars are about $50, and the basic 4-ski rack is $110. (all parts Thule.) If you have a factory rack all you need is the ski rack and the Thule Fat Mouth clamps. I think they are about $50, so rack & clamps will run you about $160 new.
http://www.thuleracks.com/
http://www.yakima.com/
Cargo boxes range in prices depending on the material and the size.
You can pick the stuff up at a discount if to are a Ski Patroller or Instructor. Also if you work for a gear store you can get Thule and Yakima on pro-deal. Both ways save you boucoup bucks!