The only time I see Rozen Maiden figgies is on ebay. I have seen some in my local store though...........the randomized boxes with a display base and figgie insdie.
If you want the whole set (the seven dolls of Traumend) is thirty pounds (so you don't have to worry about it being random) is here.
www.otaku.co.uk
This is best if you live in the uk.