If you use the online mail order, you can buy kimono in your room.
And they no need to keep running the store, so price of goods are often reasonable.
But sometimes the picture's color or feel are different from the real thing. And you need an address in Japan.
At online mail order, You can find easily a set of tools for putting kimono on.
It is very more reasonable than buying singly. Rakuten Ichiba Yahoo! Japan - Shopping
(the outside website, written in Japanese only)