If there is a used parts dealer near Rotsock, I do not know. But I will list some for you, they can also ship it to Finland.
http://www.gebrauchtee32teile.de
This is Hendrik. He is wellknown here and he also speaks English. So send him an email.
BMW Gebrauchtteile Hamburg
Helmuts BMW Teile Shop
And this one sells reconditioned transmissions with 6-12 months warranty.
Was recommended as trustful on several boards. Price is very reasonable.
Very IMPORTANT: Make a picture of the name plate of the transmission. On the block might be a different name. But the plate shows the exact number of the transmission.
AND!!!!!!
Check if the connection on the trans box to the control has 7 or 8 cables!!! VERY IMPORTANT. Here a pic from my trans with the plate so that you can see where to look for the plate.
http://tridem.han-solo.net/auto/erich/friends/f.jpg
Some more info here
http://shrubbery.student.utwente.nl/...rbox_swap.html