We order some stuff from Newark for my company and they have those empty enclosures that are shipped from the UK. I wonder if there is a retailer in the UK that might send one to you cheaper than the mailing costs you'd incur from the American e-bay site. It's weird though the Newark enclosure cost US $110 while the e-bay was US $40. You might save money on shipping but you'll have to pay a higher price for the item.

The info is here http://www.farnell.com/datasheets/530698.pdf but I'm unfamiliar with European electronics suppliers to find it over there.