Home Depot cuts $15 off Lawn and Garden Center purchases of $50 or more via a printable coupon when you sign up for the Home Depot Garden Club. (It’s free to join; the coupon will be emailed to you. Valid on new accounts with previously unused email addresses only.) That trumps our previous mention of $5 off $50 in August and the best dollar-off printable coupon we’ve seen from Home Depot in over two years. Sales tax is added where applicable. Coupon expires October 22.