Operation time is 10.00am to 8.00pm daily.
Address: 〒614-8294,5 Kinmeidai Kita, Yawata-Shi, Kyoto.
Phone no: 075-971-3700
Source: COSTCO Japan
If you're taking public transport, the nearest train station is Matsuiyamate Station. Then take either one of Keihan Bus No.16A , 16C, 30 or 620 to Minoyama Syougakkou (美濃山小学校) bus stop. Expect traffic congestion 1.5 to 2km towards the warehouse due to people queuing up for parking.
Membership costs 4200yen yearly. If you're registered as member, your spouse would get a free membership. Members can bring in children and up to 2 guests into the warehouse.
They do sell Japanese groceries like soy sauce and canned goods but most of their stuff are imported and in American portion sizes. We're talking about fruit juice in containers normally used to bottle cooking oil in Asia. And you have to buy them in 2s! And don't get me started on their pastries. They're delicious of course, but they're huge! Based on the expiration date, they only last for a couple of days. We're staying in Japan under a scholarship so we don't have the luxury of having a family size refrigerator. What we did was we went to COSTCO in the morning. Therefore we could have their bread, pizza and pastries for lunch, tea AND dinner. Or we won't have enough space to store all the food at the end of the day.
They also have non-perishables like toys, clothes, electrical items brought in from America. But I seriously didn't expect they would also sell Swarovski pendants there (costs around 6000yen each). If you can't go to the States, I suppose going to COSTCO Japan is enough. I even overheard some Japanese parents looking at the Disney themed children book collection and complained that they're of no use to them since the books are all in English :p
No plastic bag is given. Large reusable COSTCO grocery bag can be purchased at 158yen. Some people just use cardboard boxes available at the warehouse. And do bring enough cash for your purchase since they only accept cash or American Express credit card.