add_filter('woocommerce_get_price_html', 'zobrazeni_ceny_s_a_bez_dph', 100, 2 );
function zobrazeni_ceny_s_a_bez_dph( $price_html, $product ) {
    global $woocommerce_loop;

    // Pouze na stránkách jednotlivých produktů (a ne na loopu)
    if( isset($woocommerce_loop['total']) && $woocommerce_loop['total'] == 0
    && isset($woocommerce_loop['total']) && empty($woocommerce_loop['name']) ) {

        // Pro jednoduché a variabilní produkty
        if( $product->is_type('simple') || $product->is_type('variation') ) {
            // Když e ve slevě
            if( $product->is_on_sale() ) {
                $regular_price_incl_tax = wc_get_price_including_tax( $product, array( 'price' => $product->get_regular_price() ) );
                $price_incl_tax_html    = wc_format_sale_price( $regular_price_incl_tax, wc_get_price_including_tax( $product ) );
                $regular_price_excl_tax = wc_get_price_excluding_tax( $product, array( 'price' => $product->get_regular_price() ) );
                $price_excl_tax_html    = wc_format_sale_price( $regular_price_excl_tax, wc_get_price_excluding_tax( $product ) );
            }
            // Když není ve slevě
            else {
                $price_incl_tax_html = wc_price( wc_get_price_including_tax( $product ) );
                $price_excl_tax_html = wc_price( wc_get_price_excluding_tax( $product ) );
            }
        }
        // Variabilní produkty
        elseif( $product->is_type('variable') ) {
            $prices = $product->get_variation_prices( true );

            if ( ! empty( $prices['price'] ) ) {
                $act_keys = array_keys($prices['price']);
                $reg_keys = array_keys($prices['regular_price']);

                $min_price_incl_tax = wc_get_price_including_tax( wc_get_product(reset($act_keys)));
                $max_price_incl_tax = wc_get_price_including_tax( wc_get_product(end($act_keys)));

                $min_price_excl_tax = wc_get_price_excluding_tax( wc_get_product(reset($act_keys)));
                $max_price_excl_tax = wc_get_price_excluding_tax( wc_get_product(end($act_keys)));

                $min_reg_price_jncl_tax = wc_get_price_including_tax( wc_get_product(reset($reg_keys)));
                $max_reg_price_incl_tax = wc_get_price_including_tax( wc_get_product(end($reg_keys)));

                $min_reg_price_excl_tax = wc_get_price_excluding_tax( wc_get_product(reset($reg_keys)));
                $max_reg_price_excl_tax = wc_get_price_excluding_tax( wc_get_product(end($reg_keys)));

                if ( $min_price_excl_tax !== $max_price_excl_tax ) {
                    $price_incl_tax_html = wc_format_price_range( $min_price_incl_tax, $max_reg_price_incl_tax );
                    $price_excl_tax_html = wc_format_price_range( $min_price_excl_tax, $max_reg_price_excl_tax );
                }
                elseif ( $product->is_on_sale() && $min_reg_price_excl_tax === $max_reg_price_excl_tax ) {
                    $price_incl_tax_html = wc_format_sale_price( wc_price( $max_reg_price_incl_tax ), wc_price( $min_price_incl_tax ) );
                    $price_excl_tax_html = wc_format_sale_price( wc_price( $max_reg_price_excl_tax ), wc_price( $min_price_excl_tax ) );
                }
                else {
                    $price_incl_tax_html = wc_price( $min_price_incl_tax );
                    $price_excl_tax_html = wc_price( $min_price_excl_tax );
                }
            }
        }
        if ( isset($price_incl_tax_html) && isset($price_excl_tax_html) ) {
            $price_html  = '<bdi><span class="cena_vcetne_dph">' . $price_incl_tax_html . ' s DPH</span><bdi><br>';
            $price_html .= '<bdi><span class="cena_bez_dph" style="font-size:0.5em">' . $price_excl_tax_html . ' bez DPH</span><bdi><br>';
            $price_html .= $product->get_price_suffix();
        }
    }
    return $price_html;
}