Guidestar gives online shoppers to find the best deals & coupons and lowest prices they possibly can. All free Guidestar promo codes and discount codes - Up to 5% OFF off in November 2020. A total of 5 valid guidestar.org coupons and promotions are listed here. The latest code was updated on November 2020; There are 5 coupons and 0 deals available. All Guidestar coupons have been verified and tested! Please enter it at checkout.