According to user submitted information, a gram of black tar heroin in the Northern California county of Stanislaus sells for $40 to $70 per gram, depending on the purity of the heroin.
The average purchase size of black tar heroin in the city is half a gram, which is sold for a flat rate of $25. Smaller units are also sold by dealers, with 0.2 grams being offered for $10 and 0.3 grams offered for $15.
According to the recovering heroin addict who submitted the information, dealers have been known to sell “dimes”, which is 0.3 grams of high-purity black tar heroin for $10. These dealers would offer the drug at that price in order to get the customer hooked on the product. Once the customer became addicted, then the amount of heroin would drop back down to 0.2 grams for $10.
For larger purchases, an ounce (28.3 grams) can be bought for as low as $500 to as high as $1,500.
Source: User submitted data to Havocscope, received on September 28, 2013.