woocommerce_get_price_html.php

<?php
/**
 * Hook: woocommerce_get_price_html.
 * Modify the HTML for the product price.
 */
function plugin_republic_get_price_html( $price, $product ) {
  // Modify the $price HTML here
  return $price;
}
add_filter( 'woocommerce_get_price_html', 'plugin_republic_get_price_html', 10, 2 );