Need a script for Minimum Advertised Price "MAP" option

As you may know there are some suppliers that have requirements such as you may not advertise lower than their Minimum Advertised Price "MAP". There are contribs for other carts readily available, but am unable to find one for the OpenCart. Though I have seen some sites using the OpenCart have added the option such as "For best price add to the shopping cart", but am unable to find the codes. I would appreciate if anyone can guide me to the right direction or source.

Thanks,
HJ