A programmable size and price-setting mechanism for use in a vending machine has a plurality of n access doors aligned horizontally across a front of the vending machine, each of which access doors has a locked condition denying access therethrough and an unlocked condition allowing access therethrough, and each of which is selectably activatable between the locked and unlocked condition. There are a plurality of horizontal shelves each of which has a plurality of partitionable areas corresponding in size to a corresponding one of the n access doors, such that each shelf is selectably partitionable into a plurality of up to n product holding areas. A conveyor mechanism is provided for selectably moving each horizontal shelf into a vending position adjacent to the access doors so that each one of the n partitionable areas is adjacent to a corresponding one the n access doors. A sensor detects which of the plurality of shelves is positioned adjacent to the plurality of n access doors. A plurality of n actuatable buttons are mounted on the vending machine, each actuatable button adjacent to one of the n access doors. A money-receiving and value detection device is also provided. Programmable control circuitry is operatively connected to the plurality of actuatable buttons, to the shelf position sensor and to the money-receiving and value detection device for activating a selected one or more of the n access doors from the locked to the unlocked condition upon detecting a programmed value of money received, upon detecting a selected one of the plurality of shelves positioned adjacent to the access doors, and upon actuation of one of the actuatable buttons located adjacent to the one or more n access doors through which access to one of the product holding areas is desired.