Hide price for certain WC products

add_filter( 'woocommerce_get_price_html', 'product_price_html', 10, 2 );
add_filter( 'woocommerce_variable_sale_price_html', 'product_price_html', 10, 2 );
add_filter( 'woocommerce_variable_price_html', 'product_price_html', 10, 2 );

function product_price_html($price, $product) {
  if ( in_array($product->get_id(), [1, 5, 7])) { // if product ID's "1, 5 or 7"
    $price = __('Price is hidden');
  }

  return $price;
}