Railway data used by Porter (1983) in ASCII or Stata format;
Tire data used by Bresnahan and Reiss in ASCII format;
Scanner Data
The Marketing Group at University of Chicago GSB has made available online the ERIM database, which has household level data, and the DFF dataset, which includes 9 years of data from all stores of a single retailer.
The data and details can be found here.
The so called Stanford Basket, which contains household and aggregate data for 24 categories over 104 weeks, can be obtained from
David Bell at Wharton;
Ron Cotterill at the Food Marketing Policy Center has scanner data at the quarter-brand-MSA level for several categories. Details are available
here.
Prices, sales and inventories for many goods sold by a Spanish Supermarket chain are available from Victor Aguirregabiria's web page;