Hello,
Try looking for a mattifying foundation like Clarins Ever Matte Foundation or Estee Lauder Invisible Fluid. Bobbi Brown also has a great selection of foundations to choose from – now you can pop over to a Bobbi Brown counter and they’ll give you a free skincare and make-up lesson, so you’ll get to learn more about your skin and how to take of its oiliness and not simply cover it up with foundation.