Replying to Helmets

Before I get slammed I did check the search bar but I didnt find out what I wanted. I hit my head a couple of times today and it did not feel good. So I want to get a helmet that i can put a hat under and not to expensive.I was looking at the pro-tec helmets and they look like they would work. Also i have seen some kids just throw what looks to be a skate helmet over there hats. That would work also so could anyone give me any names of those types of helmets and maybe some prices.