Better spark plugs

Living in Berlin and having easy difficulties getting better candles. The ones from Champion use faster than I can screw them in. Well I have to say that I have been trying to adjust my Super e for a long time. I heard that the NGK Iridium o. VX are not so sensitive. I recently ordered the splitfire at e-bay but until the arrival is still too much time. Was at several motorcycle shops but bpr5 XXX from ngk, not indicated. Bosch WR8DP I au Does anyone know a well-stocked shop in Berlin or an online shop where I can buy small quantities? Can you recommend me more candles? Oh yes, 88 ́er EVO, Super E, 2in2 Supertrapp 10 slices. Greetings