as long as it looks like its supposed to i dont think price matters.
HOWEVER i will speak on experience, i bought a cheap wig to crossplay N from death note and it was hell. The wig was short and white which was all i needed, but i couldnt style it at all. And it was extremely uncomfortable to wear. It was synthetic hair so it was overly shiney gross to touch, and caused so much static. I will never do it again.