Claudia Stevens Facial Prep Foundation Base is a great primer. I started using this before BB creams became so popular and widely available. I apply this right before I start putting on my makeup. Primer is really important when using powder makeup as it helps the powder to go on smoothly and evenly. This primer is light weight and not greasy at all. A small amount goes a long way. I usually let it sit a few minutes before applying my makeup to allow it to settle on my skin. 

Claudia Stevens Facial Prep Foundation Base can be purchased at Sally Beauty for $5.49.