dkdesignhawaii

I needed to do a similar function showing the min to max range. Thanks to 303i for the jump start. Just needed a few extra lines of code. Hope this helps others.

/**
* Returns price range for grouped products
**/
function wc_grouped_price_html( $price, $product ) {
	$all_prices = array();

	foreach ( $product->get_children() as $child_id ) {
		$all_prices[] = get_post_meta( $child_id, '_price', true );
	}

	if ( ! empty( $all_prices ) ) {
		$max_price = max( $all_prices );
		$min_price = min( $all_prices );
	} else {
		$max_price = '';$min_price = '';

	}

	$price = '<span class="from">' . _x('From: ', 'min_price', 'woocommerce') . woocommerce_price( $min_price ) .  _x(' to ', 'max_price', 'woocommerce') . ' </span>' . woocommerce_price( $max_price );

	return $price;
}
add_filter( 'woocommerce_grouped_price_html', 'wc_grouped_price_html', 10, 2 );