Retrofitted vending systems including a card reader and a vending machine in communication with the card reader are disclosed. The systems may include a spacer positioned between the card reader and the vending machine that is adapted for mounting the card reader to the vending machine. Wireless communication device are also disclosed. The wireless communication devices may be electronically coupled to the vending machine and may include a bracket configured for attachment in the spacer and a wireless communication board fastened to the bracket.