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$20
Bought the pair 2 years ago, but never use it because it is too big for me. Forgot about it entirely until now.
https://www.amazon.com/gp/product/B000LOF6CW/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
You can pick them up at Biology department, Gilbert building. Email me if you are interested.
Please do not message this poster about other commercial services.