There are handy German published chart packs available. The ones I've got came from Kelvin Hughes in Southampton. I'm pretty sure that Maptech produce them now.
Unlike a lot of modern charts, the shore detail is very good. I've used them for navigating the hire car round a few of the islands!
Don't get b&w photo copies. The word inexpensive makes me think ouch. Get the most detailed, and never go cheap on charts. It can kill you, and I know from personal experience....dbl ouch!!!!!