Testing for PED's must be substantially more expensive then testing for illicit drugs like marijuana and cocaine. Companies can turn a profit charging less for $30 for those tests, the cost for a negative test are really only the material of the testing supplies. Positive tests are more expensive because they might need more analysis and a medical review.
They should train officials to collect samples, they are already being paid any possible travel cost and it doesn't takes take any special expertise to watch someone pee then put some tape over a cup.