proto-col offers ''Buy one get one" on some special occasions for certain items. We

regularly update the latest coupons at each period, please follow the site to get gifts as soon as possible.

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”.

Normally, one discount code is only applied for one offer. However, If the users put a vast of items in their cart, it is easy to use one coupon code to purchase items. It depends on proto-col's policy, you can contact proto-col via mail for your reference.

Once you find available coupon codes and are approved by the proto-col 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 proto-col. However, the store will surely give out notice if available.

At the time of updating, proto-col has not applied Student Discount all year round yet. Check the official store and reach out to the customer support team to be clear.