Keihin CVK40 diaphragm supplier

I have a KLR 650,the Tengai model, using the Keihin CVK40 carb. I got a local price for a new diaphragm slide assembly today and I'm just getting over the shock... $295... the same part costs $49 US on line. Who are the suppliers in Australia who do the best prices? I am in Adelaide. Maybe I use a Harley parts dealer, they use the same carby. I have four KLR's... I just like these reliable old tractors. Thanks guys.