Hello, and welcome to the forum.
This part should work, from the Soda Jerk Works.
EP14A - Use Correct Change
http://sodajerkworks.com/index.php?page=shop.product_details&flypage=flypage_images.tpl&product_id=691&category_id=12&option=com_virtuemart&Itemid=27&vmcchk=1&Itemid=27This one may also work, from Fun-Tronics
16D - Replacement "Use Correct Change" Lamp Assembly
http://www.fun-tronicsllc.com/index.php?crn=262&rn=1461&action=show_detailCavalier did use another version on some of their machine. It simply said "CORRECT CHANGE" with an amber color, but I like the one above much better. I would check with the retailers and make sure the ones above are compatible with your machine.
EDIT: I just noticed you have a Canadian e-mail address. These are both American retailers. If you go with either of them, I would also check with about shipping to Canada, customs, etc.