Great work

Great plugin!

I have made some minor modifications to include sales price and regular price and wpml support.

I hope it helps! Thanks!
George

function getRssProductPrice() {
	global $post;
	$product = new WC_Product( $post->ID );
	$theproductprice = $product->regular_price;
	return $theproductprice;
}

function getRssProductSalePrice() {
	global $post;
	$product = new WC_Product( $post->ID );
	$thesaleprice = $product->sale_price;
	return $thesaleprice;
}

function wcbfeedAddImageToContent($content) {
	$wcbfeed_rss_image_size = get_option('wcbfeed_rss_image_size');
	global $post;
	if(get_option('wcbfeed_rss_export_image')==1) {
		if ( has_post_thumbnail( $post->ID ) ){
			$content = '' . get_the_post_thumbnail( $post->ID, $wcbfeed_rss_image_size, array( 'style' => 'float:left; margin:0 15px 15px 0;' ) ) . '' . $content;
		}
	}
	if(get_option('wcbfeed_rss_export_price')==1) {
		$content = $content . '<p>' . __('From: ', 'woocommerce-better-feeds') . '<del>' . getRssProductPrice() . '</del><br><strong>' . __('Only: ', 'woocommerce-better-feeds') . getRssProductSalePrice() . '&euro; </strong></p>';
	}
	return $content;
}

https://www.ads-software.com/plugins/woocommerce-better-feeds/