buying jets online is cheap, except for the shipping I have got some 290's I can part with, I think I paid $4 each + ALOT for shipping, at magic racing, I can let them go for $10 shipped. Thats actually pretty cheap, but If I were you I would go to a yamaha dealership and exchange the ones you dont want for the ones you need. All the yamaha dealerships around here will do that for me.