You may begin with:

• Cortellis - Drug price data. Access is available to HBS AND HU students, staff and faculty onsite at Baker Library (users must be logged in by Baker staff). 
• Statista - Quick statistics on the topic
• Bloomberg - Drug retail price data (May begin with BI PHRMG)
• Micromedex - Average drug wholesale prices. (May search by individual drug name or multiple drug names using Tools > RED Book)

Additional resources:

• Manufacturer reporting of Average Sales Price (ASP) data -- Quarterly datasets by CMS.gov
• ​International Drug Price Indicator Guide -- Provided by Management Sciences for Health
• WHO Medicines Price Information -- Provided by the World Health Organization
• Common European Drug Database -- This database is an initiative of the National Health Insurance Fund Administration of Hungary to make prices of pharmaceuticals easily available for the public of Europe.