System and method for transacting for an upgrade having an uncertain availability

The present invention enables the purchase of upgrades by ascertaining and attaching a value to the certainty that the upgrade will be available and adjusting the value of the product or service for purchasers willing to pay a reduced value on the condition that the upgrade may not be available at the time of expiration. Rather than paying the certainty value, the prospective purchaser is given the opportunity to enroll in a pool for the perishable upgrade. At a certain time the perishable is released to the pool of purchasers, who are then selected to purchase the item.