What is the average cost of a wig made from human hair?

There is no real "average" price for a human hair wig. The price you pay will depend on the length of hair you want, the style of the wig, the color of the hair, and the type of hair (thick/thin, curly/straight). Some wigs will cost you about $150, while others will be well over $1,000. Check out http://www.wilshirewigs.com/Human-Hair-Wigs-c-42.html for examples.