(1) Operators must sell bingo cards before they select the first number for a specific game:

(a) If operators sell cards after the start of the game, they must ensure that the late sale does not allow any player an advantage over another player; and

(b) Bingo hard cards purchased or exchanged after the first number is selected for a specific game may only be used during later games; and

(c) Operators must not allow players to select specific bingo cards after the first number is selected for a specific game.

(2) Operators must sell all cards for a specific prize for the same price. The cards sold for a specific prize must be distinctive and easy to tell apart from all other bingo cards in play.

(3) Operators may sell similar cards used to participate for the same prize at a volume discount if they record each separate discount price with an identification code or cash register key that provides for an audit trail.