Try
www.askari-fishing.co.uk, they do sets not sure how good, but ring uk no as they can tell you if in stock in Germany before you order. or try
www.jannsnetcraft.com based in America and I have'nt ordered from them but the stuff is cheap!
By the way my previous message about reservoir trout, tried nymphs, but only thing that seemed to get bite were lure type anoying flies. Mind you it was blowing force 4! with white tops on the waves.
Good luck with the fly tying
