How much does fusion cost?

I'm curious to know, how much does the process of fusion actually cost? I've heard it's a highly complex and advanced form of energy production, so I'm wondering if the costs associated with it are similarly steep. Are there any specific factors that drive up the cost of fusion, or are there ways to keep the expenses down? And ultimately, how does the cost of fusion compare to other forms of energy production, such as fossil fuels or renewable sources like solar and wind?