Snippet to modify WooCommerce product price display

product-custom-price-display.php

<?php

add_filter( 'woocommerce_get_price_html', 'custom_price_display', 10, 2  );
function custom_price_display( $price, $product ) {

	// CHANGE FOR ALL PRODUCTS
	$price .= ' for each item';

	// FOR SPECIFIC PRODUCT
	if ( $product->get_id() == 15 ) { // Replace 15 with your product ID
		$price .= ' for this particular product';
	}

	// ADD CUSTOM PRICE FROM META e.g. Unit Price
	// $unitPrice = get_field('unit_price', $product->get_id()); // Uncomment if custom field was added by ACF
	// $unitPrice = get_post_meta( $product->get_id(), 'unit_price', true ); // Uncomment if custom field was not added by ACF

	if ( ! empty( $unitPrice ) ) {
		$price .= '<span class="unit-price">' . wc_price( $unitPrice ) . ' per unit</span>';  
	}

	return $price;
}

?>