I'm very surprised and sorry to hear they didn't accept your coupon. :( What was the coupon for that you tried to use? I started using coupons at Rundles No Frills a few weeks back and have been there three times for groceries. I've had a different cashier, including a supervisor/manager present (from pricematching) each trip and had no problems at all with coupons including the printable ones. Before I started using the printable ones there I even called ahead first and asked them over the phone if it was alright to use and they said they do accept them. So that being said it shouldn't vary from cashier to cashier as they all should follow the same store policy. If you hadn't done so this trip, the next time this happens ask for the manager and based on my experience everything should be good to go. Hope this helps and again I'm sorry to hear! Don't let it put a damper on your couponing! :)