Bought mine at Miniand - small version; only board, USB power + SATA cable. (great service btw; DHL delivery within one week.)
Finaly I came over, that those 16USD for the Dev Set, would not have been a waste..
I have recreated the simple acrylic case:
I picked some 500x500mm acrylic glass plate from our local hardware store for 5.49€ - there has been no smaller avaible, but the big leftover may be used in future projects.
In addition to it, all you will need is a jigsaw, demel / proxxon or similiar multitool with drill & grinding heads, four M3 scews & twelve nuts.
took me some hours to fill the lack of accessories, at least still cheaper