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<?php
// Use WC 2.0 variable price format, now include sale price strikeout
add_filter( 'woocommerce_variable_sale_price_html', 'wc_wc20_variation_price_format', 10, 2 );
add_filter( 'woocommerce_variable_price_html', 'wc_wc20_variation_price_format', 10, 2 );
function wc_wc20_variation_price_format( $price, $product ) {
	// Main Price
	$prices = array( $product->get_variation_price( 'min', true ), $product->get_variation_price( 'max', true ) );
	$price = $prices[0] !== $prices[1] ? sprintf( __( 'From: %1$s', 'woocommerce' ), wc_price( $prices[0] ) ) : wc_price( $prices[0] );
	// Sale Price
	$prices = array( $product->get_variation_regular_price( 'min', true ), $product->get_variation_regular_price( 'max', true ) );
	sort( $prices );
	$saleprice = $prices[0] !== $prices[1] ? sprintf( __( 'From: %1$s', 'woocommerce' ), wc_price( $prices[0] ) ) : wc_price( $prices[0] );

	if ( $price !== $saleprice ) {
		$price = '<del>' . $saleprice . '</del> <ins>' . $price . '</ins>';
	}
	return $price;
}
?>