@ xXx-Miyabi-xXx > It's quite hard to get these items if you are not living in Japan and are not Fan Club member. Most of those items on that linked H!P FC page come available for Fan Club members only later and some of them are sold only in concert places.
If you are not a FC member you can try to get these items from eBay or Yahoo Japan auctions. That's the way I get most of my Berryz etc. Japanese items.
You can also check out Shigehiro's service for western H!P fans. He has got a lot of nice "FC members only" items to me. Link to his H!P GOODS SHOP site is on the right sidebar (Blogroll).