makenmarketing

This plugin allows you to designate certain products in your WooCommerce store to have no price. Instead, it displays a configurable button for customers to request a quote directly via a chat app (like WhatsApp).
From the settings page, you can customize: 
* The WhatsApp phone number. 
* The button text and icon. 
* The predefined message the customer will send. 
* The button colors.

Quote via Chat Button

Replaces the "Add to Cart" button with a chat button for products without a price, with customization options.

MattGeri

WP Geeks

Hiding WooCommerce prices and the add to cart button has never been this easy! With Hide Prices for WooCommerce you can easily hide the prices for a specific products. You are also able to remove and disable the “Add to Cart” button.
Hide Prices for WooCommerce works with both simple products and variable products and takes less than a minute to get up and running. Simply install the plugin and configure the product settings.
Questions? Feel free to contact us and we’d be happy to answer any questions you may have.
<h4>Pro Version</h4>
Hide Prices Pro builds on the functionality of the free version of the plugin. It adds additional support for:
<ul>
<li>Individual variations – hide the prices and the add to cart button of individual variations of a variable product</li>
<li>Replacing a product or variation price with a button and custom URL</li>
<li>Replacing a product or variation price with a text label</li>
</ul>
Get <a href="https://wpgeeks.com/hide-prices/" rel="nofollow ugc">Hide Prices Pro</a> to enable these features.
<h3>Usage</h3>
Once you have installed the plugin, you will find the settings on the Edit Product page in WooCommerce, under the General tab in the Product Data metabox.

Hide Prices for WooCommerce

A plugin for WooCommerce that lets you hide prices for specific products as well as hide the add to cart button.

Quote via Chat Button vs Hide Prices for WooCommerce