Half-life: Blue Shift sunglasses

[Hazibee]

Hi! Long time lurker, first time poster here

I came upon something I thought I had lost years ago - a pair of Half-life: Blue Shift sunglasses a game journalist friend of mine gave me ages ago. I have no use for them and thought I'd put them up for sale, but have no idea of their value (if any). I'm linking a couple of photos below.

https://www.dropbox.com/s/9ct3l1h93n...185_s.JPG?dl=0
https://www.dropbox.com/s/qmr16xdzdq...196_s.JPG?dl=0

The glasses came to me loose, the box under them is a bulk box and only used to store them. The glasses are unused, and as you can see, the tag is still attached.

Any suggestions as to their value would be greatly appreciated.