I´m very interested in buying the 4 (so far) original japanese tankoubons of Biomega, but I have no experience buying on-line nor do I know any web-sites where I can buy them.
Could someone please tell me a good site where I can buy them at a good price and with a reliable and reasonable delivering time/cost?

The only one I can think of at the moment would be www.amazon.jp

It may or may not be much good, however.

http://www.amazon.jp/s/ref=nb_ss_gw/250 ... ds=Biomega

Yeah, I got mine from the Japanese amazon

Thank you guys!
I´ve already ordered the 4 Biomega volumes along with Ghost in the Shell 1.5 and an Appleseed Ex Machina artbook from the Japanese Amazon. It´s been easier than I though ^_^.
Now I hope everything will go well and I will be able to hold the Biomega books in my hand in little time.

beware of the taxes you'll have to pay the courier

Yes, the taxes are a pain. I´m going to pay almost as much for the taxes as for the mangas .

No problem. But I do hope for your sake that it isn't all in Japanese !