I doubt it'll be cheaper in Europe. Might wanna check out RangeFinderForum.com and ask the forumers there.
With the strong Euro and British pounds, for the Epson R-D1(s), it'll definitely be cheaper to purchase from the Japanese Domestic Market.
As for the M8, price may vary but as far as *new* Leica products are concerned, they are usually fixed although some dealers might offer better pricings on the 1st batch of M8s which has been sent back for hardware fixes. Newer batches of M8s are still in the range of SGD $ 7k onwards.