This plugin shows "Call For Price" text/HTML or image on empty price fields. It depends on woocommerce.
YITH WooCommerce Catalog Mode, a plugin for disabling sales in your e-commerce and turn it into an e-commerce into an online catalogue.
Replaces products with a price of zero to an open form for inquiry
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Plugin extends the WooCommerce plugin by outputting "Call for Price" when price field for product is left empty.