The only kit I've seen was on Eastwood powders. It's not cheap though. I get mine like the other guys. Tj's tackle, Barlows, Jann's. I've herd of guys getting it from powderbythepound website, good prices. Personally I recently started buying on eBay and after a few not so good paints I found a guy who sells stuff I think is better than the major jig brand.
Anyway I wanted to say... I started out by buying 4 or 5 jars. Now after a few years I bet I have close to 40 colors and clearcoat glitters, etc! If you want to know what I use most, it's the first 4 or 5 colors I purchased. Black, white, green chartreuse, yellow chartreuse, and pink.
And another thing. I paint a lot of jigs and powder lasts forever.