Yokohama's Mint store is a great source of cards for baseball and soccer fans, but they have a small selection of other sports and non-sport cards. The selection seems to be about the same as it was when I first visited a couple years ago, though I think they've kept a decent stock of recent AKB48 releases.
AKB48 hasn't had any huge hits like they did in 2011-2012, but they still are extremely popular. Cards for very popular members can be extremely pricey and full sets of cards from Ensky and other issues can cost $100 or more! Even cheap photo prints can go for $5 or more each.