Bidding car rental site similar to Priceline??
 

Looks like an excellent site to help us plan our month long visit to Golden and Fairmont Hot Springs this summer. My first question is, does anyone know of a bidding website like Priceline for renting cars in Canada? I've looked at the prices on all the well-known sites, hotwire, orbitz, travelocity, Expedia, as well as the major rental car companies. Before we make our decision, I just want to make sure I can't make a bid for one instead.