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.

wpmariocom

Price Guard for WooCommerce allows store owners to hide product prices and “Add to Cart” buttons, replacing them with custom buttons. This is ideal for stores that require inquiries or quote requests before purchase.
Features:
<ul>
<li>Hide product prices globally or for specific categories</li>
<li>Hide “Add to Cart” buttons</li>
<li>Replace hidden elements with custom buttons</li>
<li>Customize button text and link</li>
<li>Easy to use settings page in WooCommerce</li>
</ul>

Price Guard – Hide Price & Add to Cart for WooCommerce

Hide product prices and "Add to Cart" buttons in your WooCommerce store, replacing them with custom buttons for quote requests or inquiries.

Quote via Chat Button vs Price Guard – Hide Price & Add to Cart for WooCommerce