.woo-shipping-expert-promo-disabled {
    opacity: 0.6;
    color: #888;
}

.woo-shipping-expert-promo-disabled label {
    cursor: default !important;
}

.woo-shipping-expert-promo-disabled input[type="radio"] {
    cursor: default !important;
}

/* Optional: Hide price if it shows 0.00 */
.woo-shipping-expert-promo-disabled .amount {
    /* visibility: hidden; */ 
    /* Or keep it to show it's free? */
}