It's about 45 mins from mine, and I don't know if you have been back or not, but they closed Ashiya(sp) and put sanseido in. It's currently kinda small because they are adding on in the bookstore and making it larger. I like sanseido better because they get volumes from air-mail and now I don't have to wait a month to get it when the volume I want comes out =D.
Though they are missing a lot of volumes sometimes (IE: Steel ball run is always missing 1,5,7,8, and 9), and it seems like they never restock. Though I think it's just because they are in a temporary location in mitsuwa marketplace.