As the saying goes, content is king! And so having good content for affiliate sites is important. Most webmasters create some content themselves. But it is very common to supplement that content with content provided by others. Maybe articles make available in consideration of keeping embedded links in place, maybe content provided by others in a forum you run, maybe press releases or news from affiliate programs, maybe articles you pay others to write to to translate.
Besides answering the poll question, share you experiences creating and obtaining content for your websites.
Michael