I went through chemo last summer for breast cancer and after the second dose started loosing my hair. I did get a wig, in fact, two of them. I did not get the human hair wig, which would have been more expensive. I did pay around $200 for the wig but was extremely pleased with it. It was different in color and style from what my real hair was but the change kind of made me feel good. I also had many comments on how great I looked. Some actually thought I had just decided to go for a new look and didn't even realize it was a wig.
All in all, it is an individual thing. Please also note that some cancer society offices have wigs that have been donated and you can possibly find one for free.