The Caitlyn Jenner collectible market is BOOMING ... at least one auction house is hoping it is ... selling one of CJ's used racing suits -- and they're hoping to score $20,000 for it!!!
The item is the driving suit Caitlyn (then Bruce) wore during the 1982 Celebrity Toyota Grand Prix of Long Beach ... a race Bruce dominated and won!!
The suit eventually came into the possession of a collector who has decided to sell now that Bruce has become Caitlyn and Caitlyn has become a cultural icon for obvious reasons.
A rep for Nate D. Sanders, the company running the auction, tells TMZ Sports the starting bid is $5,000 ... but they're expecting bids to reach as high as $20k.
Hope you saved up!