Just thought I would share this with you all. (I have no affiliation with these guys, just got a great deal)
Kenma Australia
have a web special giving 50% off existing Pipercross air filters. I just bought 2 for my 2000 Sprint and they cost $38AUS each and didn't charge me postage.
I have never used these filters but they look pretty good (let us know if you have an opinion)
Check it out - I know in Oz we have to pay about 100 bucks for OEM and a whole lot more for K&N.