Keeping ad costs low is pretty darn simple, but many overlook it. There is a little known secret that marketers often forget. Spending less per day Means LOWER AD COSTS. That is it. Whether you have a big budget or a small one, spend under $20 per day per state. What you're going to want to do is just not spend a ton per ad, per day. So if you're boosting posts or running straight up ads out of Facebook ads manager you're going to want to keep your overall daily budget low to ensure ad cost per click, likes and engagement all stay low.