Help me help my brother!

I've been trying to turn my brother to skin care, but he wants me to tell him what to get. He had oily skin and a lot of acne scars on his forehead. He wants something simple and the most important thing is that it's cheap. We need a cleanser, niacinamide serum, and Moisturizer. Any other recommendations are welcome! Also, I would like to avoid Cetaphil or Cerave. Amazon links please :]. Thank yall so much!!