Yes they sell "geta" shoes, but are very expensive. If you really want to get into geta, I recommend jbox.com, they have a wide variety at an affordable price. However, the ambiance of buying Japanese shoes in Japan could be what you are after here, I don't know, but just letting you know another option!!
And if you are getting a pair of geta - make sure you check out their wide variety of tabi socks!!! I always have to pick up a pair or 2 to wear with my flip flops!!!