Well, the most of her new CDs is/will probably be rare ine a month or something, if you are lucky there is still first press of GREEN/Days CD+DVD on CD Japan(With long slipcase), and there is first press versions avaiable for both R/S (poster and painted CDs) and NEXT LEVEL (colored package). Those thre is still avaiable.
Then, the limited USB version of NEXT LEVEL is after just weeks extremly rare, just like her 8cm singles (poker face - TO BE)
But actually her rare CDs is still quite cheap in here (AHS). If you look at ebay, it can be cheap too. If it helps, there is a first press guide here -->
http://www.ahsforum.com/forum/showthread.php?t=86543
It isn't done yet, but wuite good ^^