I got mine from Motorsports Pro. They have 2 kits, a standard one and a bigger one for earshaves. As I recall last time this thread came up people yelled at me that I got ripped off and listed other places where you can get jets more cheaply. I would try searching on that topic and/or just waiting. Someone will wade in with their sources.
For my money, I liked getting the kit and knowing I had everything I needed. I don't know what washer to get or where to find it if need another one so I was glad to spend more for the kit. I realize I spent most of the money on the convenience of having all of it right there, not the jets themselves. So be it, I'm a newb!