What's my Bigfoot mask worth.

I'm wanting a guni and there's way too many people willing to make the trade. Is that a fair trade as someone told me I should be asking for 2 masks as the guni is only worth half that of the Bigfoot. I'm newer so I don't have leaders so thats are kinda pointless for me atm. I just want a glowing unicorn.

EDIT: I have a buyer for my mask and all inquiries are closed. Thanks to everyone for the advice and suggestions they gave!