WooCommerce Product Enquiry - Request A Quote plugin allows to create a complete quotation system with extended options.
Demo: https://codecanyon.net/item/wooquote-woocommerce-product-enquiry-request-a-quote-plugin/24256026
This Plugin remove prices, removes the add to cart button or replaces it with an enquiry form. Only if you want, because there are more settings than you could expect!
Demo: https://codecanyon.net/item/woocommerce-product-catalog-mode/14518494
Use the WooCommerce Catalog Mode - Pricing, Enquiry Forms & Promotions plugin to easily set up catalog modes, prices and marketing strategies on your WooCommerce store.
Demo: https://codecanyon.net/item/woocommerce-catalog-mode-pricing-enquiry-forms-promotions/43498179