Gap 20% off Coupon This post may contain affiliate links and I may be compensated for this post. Please read our disclosure policy here. December 5, 2009 Sharing is caring!0sharesShareTweetPin Gap has a great coupon available thru 1/30/10- 20% off your entire purchase including sale items. You can either use this in-store or online at Gap.com by using the code: GAP20. Go HERE to print your coupon.