I’ve recently written a quick contribution or modification to the ZenCart open source ecommerce software. This contribution allows you to enable M.A.P. Pricing (map pricing) for individual products. I’ve written similar contributions for OS Commerce, and for Proprietary Ecommerce Software. Contact me if you need custom work.  

MAP Pricing = Manufacturer’s Advertised Price, which in summary means you can’t display a price lower than what the manufacturer tells you, you can. You can sell it for less, you just can’t advertise it for less.

This contribution makes it so you can display some text instead of the price when it’s enabled, and the price will only show once the product as been added to the cart. (Currently it replaces the text with: “Priced so low, we’re not able to advertise it. Add to cart for price.)

You can download the instructions on implementing it here:
Map Pricing v1.0