I happened to see these photocopied coupons at the customer service desk of Kenaston RCSS this afternoon. It is valid from 27/9 till 3 October (ie. tomorrow). You spend 100$ + in store and get a 10$ PC GC. If you need to do your grocery shopping at RCSS anyway, 100$ is not impossible to spend away given their sale and price match and get back 10%.