JS modication to BigCommerce Stencil Theme

We require a script modification to be written (probably in JS) to change the way a price is displayed in a bigcommerce store. Our store uses a STENCIL theme, and we would like a $0 price to be displayed as "POA" instead of $0. All non zero prices would display normally. Theme used is Brixton Warm. The "POA" needs to be displayed both on the Product Category, Product and Featured Product pages.