Are there any collectors of dreamcast stuff that would know the value of a Half-life for dreamcast promotional poster?

As far as I can tell from google searching there isn't much in the way of advertising for this game available since it was never released. I have had this poster stored away for a long time, back when I used to help run a local lan-party. This was given to us by valve (sierra at the time) to use as either a prize or just gaming content to put up at the event. Its 30" wide and about 6-7' tall.
pics in my dropbox:
Dropbox - 2016-01-09 19.21.20.jpg
Dropbox - 2016-01-09 19.21.30.jpg

The second photo shows the only rip the poster has, also there are pin holes on the top and bottom from it being hung at the lan-party.

Id love to hear anything from the community on this, I'm not sure if i'm going to sell it as of yet but there is always that possibility.