There is a wide range in price between different ADHD drugs, and even in the price for the same drug from different pharmacies. Here are some examples:
Concerta 54mg, 30 tablets: 123.90 at Superstore pharmacy vs. $111.32 at Costco
The manufacturer is distributing co-pay benefit cards through doctors and pharmacies which covers the difference in cost between Concerta and the generic version. For the Superstore, this difference was $36.56, bringing the price down to $87.34.
MPH-SR(generic Ritalin-SR) 20mg, 90 tablets: 37.39 at Superstore pharmacy vs. 26.42 at Costco.