I buy Vallejo paints that come in dropper-top bottles. I also have acquired a number of the same bottles empty and use them for the handful of Citadel paints that I use. You can get empty bottles from www.thewarstore.com, either the Vallejo or the Reaper bottles will do. I also have some pipettes made by Testors, but they're not as convenient to use since they require cleanup if you plan on using them more than once.