Been watching the rental car prices steadily come down on other travel booking sites, so thought I'd give it a try on Priceline (using link). First bid at $18/day accepted for total price (incl tax/fees)of $307.20
Have been bidding for couple months for these dates. Finally! Bid $90 @ 3.5* Convention Centre .... rejected Added White House area for $100 ...... rejected Added Dupont for $110 ........................ accepted and upgraded to 4*