1 Depending on the type of test, the costs of a drug test can range anywhere from as little as $15 for a DIY test to as much as $150 for a hair follicle test. For a self-administered drug test, you can just simply buy a kit at your local pharmacy from $15 to $50. 2  Aside from the brand, the actual price of these kits is influenced by the number and type of drugs you want to detect.