Currently, Chikuhodo's only brick and mortar shop is in Kumano, although they also have a travelling counter which tours various department stores around Japan (dates and locations are listed on the front page of their site). Their webshop only ships domestically within Japan -- I ordered mine from here, borrowing a kind friend's Japanese shipping address.
The Z-series is Chikuhodo's second most expensive range, all handmade and mostly consisting of uncut grey squirrel hair -- the naturally tapered shape of each hair picks up and deposits pigment far better than any laser-cut brushes. All the Z brushes are available separately, or in a set consisting of Z-1 through Z-8 and a black or white brush roll.
Another friend generously allowed me to play with and photograph her Z-series set and Z-10 brush, thus rendering me awesome by association, gotta love it.... (ed: this worked so well that no-one seems to have read the disclaimer at all so I'm bolding it.)
Z-1 grey squirrel round powder brush (brush length: 16cm // hair length: 45mm)
Z-2 grey squirrel "candle-shaped" highlight brush (15cm // 37mm)
Z-3 grey squirrel flat top contour brush (13cm // 15mm)
Z-4 grey squirrel rounded flat cheek/highlight brush (15cm // 36mm)
Z-5 grey squirrel rounded flat eyeshadow brush (13.5cm // 19mm)
Z-6 badger angled eyebrow brush (12.3cm // 5mm-8mm)
Z-7 kolinsky flat lip brush (10cm-16.5cm with cap // 10mm)
Z-8 grey squirrel rounded flat cheek brush (16cm // 40mm)
Z-10 grey squirrel "candle-shaped" eyeshadow brush (12.5cm // 11mm)
The Z-9 brush, which she doesn't own, is a rounded flat grey squirrel powder brush 16.5cm long with a hair length of 52mm; it looks to be a large version of the Z-8 around the size of the Z-1.
Z-5 grey squirrel eyeshadow brush
Z-6 badger eyebrow brush
Comparison between the Z-4, Z-8 and Z-1
Bear in mind these pictures were all taken pre-washing -- grey squirrel brushes do fluff up quite a bit after washing and a few uses.
Comparisons of Chikuhodo brushes with some others in my motley collection, including Suqqu and Hakuhodo, are still to come.