Spyfu (www.spyfu.com) Download competitors’ online advertising spending, keywords, and ad-word details. Consistent and repeat spending generally indicates successful advertising ROI. Standard Rate and Data Services (www.srds.com) Check out this resource for annual listings of magazine and company customer mailing lists available for rent. If you’re considering creating a how-to video for duck hunting, check out the size of customer lists from hunting gun manufacturers and related magazines first. Use the print version in libraries instead of paying for the somewhat confusing online access.