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I have a Guest Pass a friend passed to me but I’m not really interested. I’m willing to exchange it with something on gog. Anyone interested?
No one on the steam trade forums biting on your offer eh? :)

Probably because people tend to give this stuff away for free:
http://www.gog.com/en/forum/general/diablo_3_guest_pass_thread/page2/?search=guest%20pass