1. A method, comprising: presenting, to a customer and via a vending machine, an offer to purchase at least two products for a single package price, wherein a first product must be selected from a first inventory group and wherein a second product must be selected from a second inventory group; outputting indications of which products sold by the vending machine are included in the first and second inventory groups, wherein the outputting comprises selectively illuminating one or more lighting devices proximate to each product position within the vending machine; receiving an indication that the customer desires to purchase the first product from the first inventory group and a third product also from the first inventory group; presenting, to the customer and via the vending machine, an offer to purchase the first and third products for a single price that is greater than the single package price; receiving an indication of a payment of the single greater price by the customer; and dispensing, in response to the receiving of the indication of payment of the single greater price, the first and third products to the customer.