How to Find Costco Machines?

In Taiwan, we're all on budget. You can just grab things and you don't know how much you spend. How do you find it? The machines. They're like scan machines. And then you get your total, you go to the payout thing. There's no people. So for example, you could put things in your bag that you don't scan. But what happens is you have to weigh it, don't you?