Usually this Costco is pretty good. The last time I was there, I had a gift card that I was going to use, and the cashier forgot to add that credit toward my bill -- instead he just charged my credit card for the entire purchase. The supervisor had to come over and manually redo my transaction so that the credit could be applied, but then forgot to add a case of water (which is $2.99), so as I was leaving, I got stopped by the gentleman and had to YET AGAIN go back and pay for my water (which caused the line to get all backed up -- all for a case of water). I get that they get busy, but if they take their time the first time, it can avoid wasting others' time in the end.