Nielsen publishes a fair amount of ecommerce conversion data. For example: http://blog.nielsen.com/nielsenwire/consumer/nov-e-commerce-update-sites-with-high

Nielsen publishes a fair amount of ecommerce conversion data. For example: http://blog.nielsen.com/nielsenwire/consumer/nov-e-commerce-update-sites-with-highest-conversion-rates/ http://blog.nielsen.com/nielsenwire/consumer/nov-e-commerce-... I'd suggest digging around in the archives there to see if you can find some newer stats. Your verticals are pretty specific, so it may be tough to get exact numbers for those categories. Perhaps you can find data for verticals with similar average order sizes as the product categories you are targeting. That wouldn't be perfect but would probably be directionally correct. Good luck!