Your recurring subscription will offer you a 10% discount on your selected product. This discount is against the full priced product value. If you purchase the product during a sale or promotion, your recurring subscription price will be at the full price value (minus your 10% subscription discount), not the promotional price.
Shipping charges will be applicable to subscription orders if they do not meet the free shipping threshold (60 USD for US orders). The free shipping threshold is calculated before tax and after discounts.