What are the Key Factors Influence a Wig's Price?

What are the Key Factors that Influence a Wig's Price ?

As a wig beginner, I often feel so confused when trying to buy a wig but the wigs' prices vary in a large range. It's really hard to decide which one is the best one, and it will get harder when someone comments below a product that we trying to buy, saying she/he has bought a much cheaper one from another place.