I guess they have supplier issues over there. The latest notice on yodobahi website says that stock is low and some stores have none. They will restock on 28th. It's 3150yen for pro pack.
Stores which have it in store:
I managed to find some in a store called Popeye Camera in Jiyuugaoka. It was about 200 yen more for pro pack. It's a nice trendy suburb and it's worth a visit.
Otherwise I shot using Pro400H and the results are great. I like that film as well, so it wasn't too big of an issue.