Global Price Reporting Mechanism (World Health Organization - AIDS Medicines and Diagnostics Service (AMDS)) contains prices of shipments of pharmaceuticals in an international development context.
For each listed transaction the drug, price, strength, dosage form, destination country, shipment method, manufacturing company, manufacturing country, the date of order, consignee and grant number are given, if appropriate.
Data is available for a comprehensive set of countries and drugs. You can search with wildcards to get all the data, and there is an Excel output option.
This includes data from The Global Fund's price reporting mechanism, it is transferred over to the WHO dataset on a regular basis.