I've been to O'Brien's Sandyford liquors just today - after being charged an extra ~10 Eur for 4 bottle of wine comparing to the aisle prices - so I asked the manager how come? He replied to me saying it's a genuine mistake refund to follow no question. All's fine unless it'd be a second encounter within a month. Is this how the people make extra money? This is very annoying, not too many people check their receipts (specially elderly ones) I had a feeling that the guy at the till had a micro stroke when I asked for the receipt - as least his eyes showed that. Selling is always a scum in a good way, but should it go to that extent??