Q. Scanner Data?

•  Nielsen Scanner data is available to PhD students and faculty only.  This is by contract. Undergraduates and Masters students are not allowed access.  Go to Kilts Apply Portal to sign up for an account for academic research.
• Convenience Store Transaction Data. Access via Dewey Data.   Available to all at Princeton for academic research. 2019+
• IRI. Access via WRDS point-of-sale information for more than 11,000 grocery stores and 7,500 drug stores. 1983-1997.

Not scanner but related:

•  Consumer Edge. Provides data-driven insights focused on the consumer. Founded in 2009, CE is a data and insights as a service (IaaS) company delivering unparalleled views into consumer spending behavior coupled with deep industry knowledge and analytical expertise. CE solutions provide key stakeholders across the corporate and investment landscapes with best-in-class tools to enable enhanced strategic decision-making. CE's unique capabilities allow for actionable insights driven by near real-time market intelligence and benchmarking. Credit card and debit card data transaction data by company.
• Consumer Insights. 10 years’ (40 quarters) of online survey data in the United States. Unaided product and outlet capture allows read of much smaller brands and retailers. Data in this file is for years 2012-2022. Primary, quantitative survey data allows collection of comprehensive KPIs not available through POS data, receipt data, or other sources. OpenBrand's market insights and consumer survey data for durable goods provides researchers with the information needed to uncover trends, reveal patterns, and even predict consumer behavior and industry trends. These data include 10 years of historical data from market share to purchase drivers to consideration sets, demographics, online v. in-store channel and more.