A reverse-marketplace is where instead of sellers uploading the products that they wish to sell on a market platform, it is the buyers who create detailed requests (posts) for products they wish to buy, with sellers (exhibitors) then proposing offers based on their inventories that match the open-call inquires.

Within the Postbys platform, a reverse-marketplace is created for each tradeshow before its start and lasts until the end of the event.

This is the best way to help you find exactly the product you're looking for and get competing offers from exhibitors.