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There are a few hundred live examples from 2013 in the Centurica website buyer reports - http://www.centurica.com/website-buyers-report.

At time of writing (August is usually quiet) there are around 300 brokered,web-based businesses for sale between $20k and $2M.

Averages are severely deceiving but If you were to look at average multiples alone you would find a typical range between 1.8 and 3.7x annual net profit.