The present disclosure is directed to facilitating pricing, sales and delivery of a commodity. By inserting two RTD diodes in series with resistors, the negative resistance of the first and the second RTD diodes reduces the effective RC time constants of the resistors and latch, leading to a faster regeneration during a latching mode of the comparator than achieved with alternative designs. Activation of the CAM card as a transaction card allows the customer to purchase goods and services from one specific vendor and to establish a relationship with that vendor for the goods or services rendered while enjoying reward benefits based on those purchases.