Humidity control

I am a first time grower and I am having trouble with humidity in my grow space( a closet), is there any tips or advice??

You could buy a dehumidifier which could be pricey but I'm sure they're cheap ones you could get at walmart or something.

Is there any really cheap method that doesnt include electricity? like a product that pulls moisture out of the air?? I think I heard of something like that but I am not sure