Change WooCommerce Product Retailers button text

wc-product-retailers-label.php

/**
 * Add as many cases as needed; this will change all button labels for a retailer
 * NOTE: this will only work if the product has >1 retailer (multiple buttons)
**/
function skyverge_change_retailer_button_labels( $label, $retailer, $product ) {

	switch ( $retailer->get_name() ) {
		
		case 'Amazon':
			$label = 'Buy Paperback at Amazon';
			break;
		
		case 'Kindle':
			$label = 'Buy Kindle Edition';
			break;
		
		case 'iBooks':
			$label = 'Buy iBook';
			break;
			
		default: 
			return $label;
			
	}
	
	return $label . ' - $' . $retailer->get_price();
	// Use your currency symbol intead of $ if different from US dollars
		
}
add_filter( 'wc_product_retailers_button_label', 'skyverge_change_retailer_button_labels', 10, 3 );