^ Yep, eBay is probably the best bet.
I have the Dojo CD which was mastered from a vinyl copy of the album and includes ''Motorhead'' as a bonus track. Nowadays it'll cost you about 40-50 Euros from Amazon though.
The US Griffin version was mastered from the original recording tapes and is harder to find. It reproduces the fold-out artwork in the shape of a shield, like the original vinyl. Very nice but even more expensive. It also includes ''Motorhead'' bonus.
There are several other versions for sale on labels such as Rock Fever, Phantom, Ridgetop... I can't say how ''authentic'' these are though, if you know what I mean. Best to get the Dojo or Griffin versions if you see them at an affordable price. Sorry I can't be any more help