30% off your purchase at Old Navy. By Toya M. • March 5, 2012 • No comments Take 30% off your purchase at Old Navy. Use code THANKYOU at checkout. This offer expires tomorrow, March 6th. Related PostsOld Navy: $10 off $50 CouponsTake 30% off at Old NavySave $10 off $50 at Old NavyTake 25% off one item at Old Navy Old NavyOld Navy Coupon