M.S.
I really like Rimmel's Stay Matte Clarifying Foundation. I have ultra sensitive skin and rosacea, so lots of uneveness. It never feels oily and is around ~$7 at Target. Somone else recommended Clinique superfit, which I've worn before, but it always feels greasy on my skin.
I would suggest going to as many stores/websites as you can and asking for samples before you buy.