Removing the price in woocommerce and having text instead?

The website I am building is here

Instead of having a price or saying Free! I would like it to read ‘enquire for price’.

The idea is you choose your products by adding them to cart, fill out the checkout form and the client receives the customer order via email. The client then emails the customer back with prices and info etc.

Is there away of replacing the price with text?

I have the ‘Woocommerce Product Add-ons’ installed and thought I’d also buy ‘Catalog Visibilty Options’ plugin.

I thought this would enable me to remove the price and replace it with text (which it does) but it also removes the ‘product-add-on’ options from the products page.

Any help appreciated!!!!