I reserved a mid size car for mid-November in Maui with Alamo for $163/week made through Costco. I've also got a Hotwire search on-going and have checked a few other places. I might save $20 bidding through Priceline but it ends up more expensive in that with Priceline you only get one driver and to add my wife would be $10/day additional...or $70 more.
Either way, unless the drop the price to $100/week with taxes, the Costco rate is likely going to be the best.