Remember, this is Amiga stuff we are talking about. The price isn't all that bad considering I paid more for my micro A1 and Cyberstorm boards still sell for much more on EBay.
I paid $1500 CDN for a complete micro A1 system including the OS4 pre-release a few years back. Looks like a case, hd, OS4, DVD & SAM will set you back about $1100 by my estimation (depending on your selected componets of course).