Despite the fact that Microsoft plans to offer an upgrade from XP, Vista or Windows 7 for $39, it is not clear if the similar sale action will happen in Europe. What we can confirm is that you can preorder a physical retail box for €59 from some Europe based retailers, including Ditech, an Austria company that ships to most parts of Europe.
The less expensive, a €99 retail box of Microsoft Windows 8 32Bit DVD, OEM, German or English as well as Microsoft Windows 8 64Bit DVD, OEM, German or English. To avoid confusion each language comes in its own packaging.
If you are after €139 Windows 8 PRO additional four options are available. Microsoft Windows 8 Pro 32Bit DVD, OEM, German, Microsoft Windows 8 Pro 32Bit DVD, OEM, English, Microsoft Windows 8 Pro 64Bit DVD, OEM, German, or Microsoft Windows 8 Pro 64Bit DVD, OEM, English and the price is the same for each of them.
If you pre-order today, you will get your version from 27th of October a day after the official US launch date, which probably could mean is the official retail shipping day for Europe.
You can find them here.