i dont know very much about opium, but around here it goes for about 10 a gram which is apparently marble sized. i wouldnt know cuz ive enver bought any. i have had some in my weed i bought one time. it was awesome. we sat in a car at a stoplight and just stared at it for aobut 30 minutes it seemed, until some guy got out of the car and knock on our window lol