Seems like an interesting idea for Courier World.  Description of a Double Dutch Auction from (Introducing interaction-based auctions into a model agent-based e-commerce system—preliminary considerations):

This auction is relatively counterintuitive and in
its basic version works like this (based on [1]): a buyer
price clock starts ticking at a very high price and continues
downward. At some point the buyer stops the clock
and bids on the unit at a favorable price. At this point
a seller clock starts upward from a very low price and
continues to ascend until stopped by a seller (who offers
product at that price). Then the buyer clock resumes in a
downward direction, followed by the seller clock moving
upward. Trading is over when the two prices cross
(purchase is made at the crossover point).

So a reverse version would be the above just in reverse.