I like to use another brand’s finishing powder, but it is high end and expensive. When I get a deal on it I buy it and the rest of the time I use e.l.f. Mineral Booster. It really does accomplish the same thing as the high end product. I usually buy directly from their website paying between $4.00-$8.00 USD depending on what kind of sale they might be promoting. I use it to set my foundation and it controls my oily skin for about half the day (which is the case with any powder I use). The primary ingredient is cornstarch, which makes the product silky and good at absorbing oil.
A little goes a long way and this size container lasts me for months. I tap some into the lid and apply with a fluffy brush. When my skin starts to slick up, I usually don’t reapply because it’s difficult to bring a loose powder with you, so I blot.