Academic association of consumer behavior, including conference proceedings and other resources. Archives of Advances in Consumer Research go back to the 1970s for the US, and more recently for international conferences. Search for a topic related to consumer behavior to find a lot of interesting work.
Retail industry data, including a lot about consumers.
"Data in the Retail Insight Center comes from public government sources, such as the Bureau of Labor Statistics and the US Census, from NRF’s consumer research conducted by Prosper, and additional consumer data from the Monthly Consumer Survey."
An oft-conducted survey of American consumers to determine their satisfaction with goods and services of both domestic and international companies with a major presence in the US. Data is released regularly and includes benchmarks and reports for 43 industries.