I like the oil paints of Pannon Color. They’re easy to obtain, affordable, and good quality. I recently found the oil paints of Blockx (made in Belgium), and it became a favourite. They only use poppy oil as a ground for their light colours, which is important because poppy oil prevents yellowing, and wrinkling. Furthermore, they’re 100% pigment, high quality oil paints, with maximum lightfastness. Yes, they’re expensive, but they’re worth it.