To avoid this problem, you should check out carefully Drish promo code before that promo code could be expired, some promo codes are tied to a minimum purchase, a first-time purchase, or tied to geography, and other reasons.

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

Yes. Coupons for each Discount Event of Drish will be collected here while being updated day by day. Sometimes, there will be deals not updated promptly but it's rare, we expect sympathy from you. 

Yes, it has ever. It may not be available now, but it is completely possible for loyal customers of Drish to get it by tracking all of its promotion programs.