To try and gage your sales, you need to take a look at what your competition is offering, what quality and at what price.
One of more popular ones is faveral, and his bric-a-brac packages, AFAIK
Take a look at this one for example: http://www.renderosity.com/mod/bcs/index.php?ViewProduct=30140&vendor=faveral

Hope that gives you some food for thought :)

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