The TVTropes Trope Finder is where you can come to ask questions like "Do we have this one?" and "What's the trope about...?" Trying to rediscover a long lost show or other medium but need a little help? Head to Media Finder and try your luck there. Want to propose a new trope? You should be over at the Trope Launch Pad.
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What about "Reverse Auction"? Where you're bidding on the right to do a service or make a product with less, not more, than someone else? "Bid a Note" from "Name that Tune" is a classic example.