If it is the first time to go, first find a big black tape (the kind that takes goods) and decorate it casually, so that the bag can stand up and let the stall owner think that you really take goods. When asking the price, ask "how to get the goods". When asked how much to take, don't be afraid, be confident. You can say to try the full-size version first, sell well and make up a lot ... The most important thing is not to let the stall owner think that you are getting the goods for the first time.