Magento 1.9- If product $0 instead of showing price show 'Contact Us For Price'

If product $0 instead of showing price show 'Contact Us For Price'.

Not sure but it might be due to ===. In this case == should be more than enough.

Instead of comparing a string try and use the finalPrice value which is numeric. It would also prevent any issues if the format of your price HTML ever changes.

if ($_product->getFinalPrice() == 0) { 
    echo '
Contact Us For Price
'; 
 }else{ 
    echo $this->getPriceHtml($_product); 
}