i has portal and dont know what to do with it any one wanna trade it for something like dota 2(post your suggestions below!)

You might have some trouble finding takers. I heard that they were basically giving Portal away free on steam over the holidays, plus it's been available on Orange Box for a couple of years. There's a thread called "Classifieds" if you want to post this in there, if there really is someone without portal it'll give you an extra chance to find them.

If memory serves steam have gicen it away free twice.

Added to the orange box and that if you join steamgifts your probly the only one who will enter for it.

Hate to tell you but Portal is basically worthless for the vast majority of gamers

Yeah, i think Portal doesn't have much value, unless it's Portal 2 or Postal 3. I saw somebody put his copy on Steamgifts, knowing Steamgifts it's normal for any public giveaway to have hundreds to thousands entries but for Portal the entries is always extremely low compare to others.