Anyway, in my experience, garden-variety Skippy can be found at International supermarkets (like Yamaya, Meidi-ya, Reimei, and Seijo Isshi) and on many online retailers, but organic peanut butter, the kind that you have to refrigerate and mix the oil back into before using, is a bit harder to locate.
I was able to find some at iHerb.com, an online retailer I reviewed a couple months back.
I placed my order on a Monday and had a glass jar of Arrowhead Farms in my hand by Friday afternoon. The pricing on the bottle was reasonable (about 718 yen, or $7.25, for 16 oz.), and the 400 yen shipping covered up to 30 pounds of product in the shipment. That's 400 yen for international shipping from the US. I cannot believe how cheap iHerb's shipments are.
If you decide you'd like to try them, too, and are feeling generous, consider using the referral code for AccessJ's account: CJG622
It'll save you a bit of money and help fill another peanut butter craving. ;)