The prices are being increased artificially, if there was so much interest in the Enterprise, surely an avalanche would be noticed on this website.

It is not the only case, see the price put by other Enterprise sellers.

If you really have too much money, have a look at this one, £799 not even a 128! http://www.ebay.co.uk/itm/Enterprise-64-in-mint-condition-extremely-rare-boxed-Not-128-/152343371807?hash=item23785f601f:g:jEcAAOSw4GVYRBXZ

It is a joke.

... or motivation to build a clone

printing the case is more expensive than this ebay items...

Other for sale on eBay ....
http://www.ebay.co.uk/itm/Enterprise-128-boxed-ENGLISH-version-FREE-worldwide-tracked-shipping-/232170087707?hash=item360e6a651b:g:tCAAAOSw44BYS8kv

Fishertechnik Robot Interface 30520.



Used on the Enterprise Fishertechnik robot arm tests at ENTERPRISE Computers GmbH:



Unfortunately the Ebay offer doesn't have the PC Centronics lead, but on the other side it is not necessary as the Enterprise uses an  edge connector.

The pinout and details can be found here.

It can have interesting uses, aside of managing the robot arm, because the interface allows the control of four motors, switches and sensors:



A little overpriced compared with this web page.

Mmmm....

But, here in Spain only the EP128 was offered....

The original unopened joystick adapter in the box confirms it, because I knew the technician of the seller on Spain. They manufactured their own adapters and cables. I bought from them a Monitor RGB cable.

On the other side, the main plug is not of the English type, so probably it comes from another European country.