// Notice: Online checkout temporarily unavailable
add_action( 'wpsc_top_of_shopping_cart', 'si_cart_unavailable_notice' );

function si_cart_unavailable_notice() {
    echo '<div style="background:#fff3cd; border:2px solid #ffc107; color:#856404; padding:15px 20px; margin-bottom:20px; font-size:15px; border-radius:4px;">
        <strong>&#9888; Online checkout is temporarily unavailable.</strong><br><br>
        To place an order, please call us at <strong>(718) 605-9600</strong> or visit us at 4820 Arthur Kill Road, Staten Island, NY.
    </div>';
}