Developer to Consult on a Unique Shopping Cart Solution for our Charitable Event

HERE IS A BRIEF DESCRIPTION OF OUR EVENT BEFORE DESCRIBING THE TASK THAT WE NEED ACCOMPLISHED: We are hosting a fundraiser that sells GOLF balls for $5. We number each ball and give each purchaser a receipt with the number of their ball. On the advertised day, we are going to dump all the balls from a front end loader, crane, plane or helicopter. The owner of the ball closest to the designated pin or hole wins a portion of the profit and the remaining funds will be donated to the Kellogg Eye Center to fight against BLINDNESS. HERE IS WHAT WE NEED ACCOMPLISHED: We are looking for a developer to provide some consulting and if applicable execution on a solution. We need to allow attendees to our event the ability to purchase a golf ball online and in return designate them a number. We need consulted on the best method for doing this. We looked at [login to view URL] and PayPal but do not know if they have the functionality to assign the PURCHASER a number and store the contact info and associated number for US to know who owns each number come the day of the event. We are looking for recommendations on a solution. Then we may need assistance putting the best recommendation into application. Thanks in advance for bidding on this project!