Recreational marijuana prices can very in Colorado. In a big city like Denver, prices tend to be much lower than a small mountain town. Almost all retail locations also have a large selection. You might find some low grade stuff for $5 a gram, but the best quality stuff could be over $20 a gram. Some places will give discounts for buying more. For example, $50 eighths or $300 ounces of their best quality and $20 eighths or $100 ounces of their lowest quality.