woocs_raw_woocommerce_price

add_filter('woocs_raw_woocommerce_price', function($price) {
    return round($price * 2, 0) / 2;
});

add_filter('woocs_raw_woocommerce_price', function($price) {
    global $WOOCS;
   /*
    if ($WOOCS->current_currency === 'USD') {
        $price = round($price + 0.01) - 0.01;
    }
*/

    if (($price <= 1000))
    {
        $price = round($price / 1000, 0) * 1000;
        return $price;
    } else
    {
        $price = ceil($price / 500) * 500;
        return $price;
    }
});