Here are some good links about marketing and consumer behavior.
Consumer Expenditure Survey Summary statistics from the Consumer Expenditure Survey which is conducted by the Bureau of Labor Statistics. Provides information on buying habits of American consumers. Data available from the mid-1980s to the present.
The Internet Public Library The IPL is a massive collection of organized free links produced primarily by students of library and information sciences at the University of Michigan. Under the “Business” category, click the sub-category “Marketing and Advertising.”
The Emergence of Advertising in America Duke University Digital Collection has over 9000 images relating to American advertising history; easily both searched and browsed.
The Encyclopedia of Psychology A website maintained by an academic in the field, which contain numerous links. Updating is current and links are intelligently organized. A search function will guide you to appropriate sites.