Users can buy/sell cards on the secondary market.
- To buy an edition: users submit a bid order which sets the maximum they are willing to pay for the edition. If an edition within the user's bid order range is available will be filled immediately, and the buyer will receive their edition. Otherwise, the edition sits on the order book until a seller is willing to sell an edition within the buyer's order range.
-To sell an edition: the user submits a sell order which sets the minimum they are willing to sell the edition for. If a buyer submits a buy order which meets the sell order, then the order will be filled immediately. Otherwise, the sell order sits on the order book until a buyer is found or canceled.