Can I combine sale discounts & coupon codes? Mat August 13, 2020 18:45 Only one promo code or coupon is permitted per order, so use the best one you have! Related articles Will I pay sales tax? Will I be charged in full when I place the order or when it ships? How does the 100 Day Trial work? Do you offer financing options? Are there any return fees? Comments 0 comments Article is closed for comments.