The nearest available weight to an ounce is one-half which is equal to 14 grams. It goes at an average price of $140 but the price can vary from $126 to $240 depending on where you’re getting it from. The average cost of an ounce of weed in the U.S. is $280. Do not be surprised however if you get it for as high as $420 or as low as $252 in some places. The different regulations and guidelines obtainable in different places is the major reason for these variations in prices.