Hmm, best bet is to visit a local DIY/hobby store and check the art department. I use paints from a company called Marabu, but that's just because it is the stuff I have at hand around here.
Normally, you find water-based acryllic paints in small glasses (maybe 1 ounce), and that's already all you need. There are also artist colors in tubes available, which have a lower viscosity and finer pigments, but they are more expensive and also more brittle, and they are normally matte.
As a tip: make sure you get a glossy paint, because the matte paints catch up dirt quickly (much like normal engravings...).
--------------------
DizzyFugu - Reporting from Germany
Confused by bowling? Check out BR.com's vault of wisdom: the unofficial FAQ section