On a payment plan ? most will require you to buy within Germany and for
the obvious reason, if you decide to not pay they can't get it back, or at least
it is very hard for them. Good luck with that. I know that no stores in the US or
UK will touch a international sale that requires a payment plan, unless your talking
corporate purchases. The risk is too high.
Websites won't touch that either, at least the honest ones won't.
EDIT:
One thing you may try, apply for ebay credit, if they extend you a credit line I
think they may ship with a minimal payment ?