Authentic OMG Gaiaonline hat

I made this thread to ask what would be an acceptable price to buy or list a real and authentic OMG hat online?
I'm merely asking for advice. (If I shouldn't even be asking the question please get my thread locked!) I've seen fan made ones up selling up to 150 USD... So please, any feedback on price is appreciated. Thank you so much and have an awesome day ^-^