On Quake 2 Community Pages - start at www.polycount.com . But never forget: an Artpiece is always property of its Creator. Only when the creator declares it as public domain or allows royalty free usage it can be used without limits.
In all other cases you should ask the Creator of the model, esp. if you want to use his work for something commercial.
In all other cases you should ask the Creator of the model, esp. if you want to use his work for something commercial.