Hello Boltman1,
Thanks for the post, unfortunately the online shopping cart is set up so that you can only use one promo code per order. I recommend using the order comment field on your order to advise us to add any additional promotional discounts to your order, these will need to be manually adjusted when we receive your order. I apologize for the inconvenience this may have caused. If you have any further questions please feel free to contact our Customer service Center at 1.800.566.3474
Best regards,
Walter
Marine Depot Customer Service