Abstract: A vending machine for dispensing articles such as scrub garments. The machine defines plural rows of slots for receiving articles, with the rows vertically stacked so that slots in each row form vertical columns with slots on adjacent rows. A separate lockable user door closes each slot level. A slot door assembly between the slots and the user door operates to open a particular slot, and only that slot is accessible when the user door for that level is unlocked and opened. The slot door assembly comprises separate user doors numbering one less than the available slots and slidable to expose any one column of slots at a time. A slot access mechanism moves adjacent the slot doors and extends to engage and displace the slot doors blocking a particular column of slots, so that one slot in that column becomes accessible upon opening a particular user door.