Render the product cost on the product page for simple products

wc-cogs-product-page-cost.php

<?php

add_action( 'woocommerce_single_product_summary', 'show_product_cost', 15 );

function show_product_cost() {

	global $product;

	$item_cost = get_post_meta( $product->id, '_wc_cog_cost', true );

	if ( '' !== $item_cost ) {
		echo "<p>Price: " . woocommerce_price( $item_cost ) . "</p>";
	}
}