In case you enter a discount code during checkout that doesn't exist or isn't currently active, then you can see the message: “Unable to find a valid discount matching the code entered”.

Of course not, most coupons may be used only by you when you received them directly from KOS. As the KOS coupon includes your User ID, it cannot be resold or transferred in any way.

Most Big Discount Events of the year witnessed a vast number of coupons from KOS released. Especially, on federal holidays such as New Year’s Sale, Thanksgiving, Christmas... or on other important days such as Valentine’s Day, Easter, and Father’s Day..., customers also can buy at KOS with numerous coupons.

Once you find available coupon codes and are approved by the KOS official store, you can submit them to us at Coupon Submission. We are not responsible for the reliability of coupons provided by customers.

Usually, Coupon Stacking is not allowed at KOS. However, the store will surely give out notice if available.