I was thinking of asking a question like this, i just today ordered plugs from www.clubplug.net and i got 10 for under the price of 4 at the dealer even after shipping. i was thinking well i wanna get oil and filters cheaper too, its gotta be out there, help us out!
you may want to try a place called CycleGear. They have a website and can pretty much get anything you need from clothing to parts. I'm not sure if they have great deals or not, but they specialize in nothing but motorcycles. It's worth a shot.