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Amazon did build one. https://en.wikipedia.org/wiki/A9.com https://en.wikipedia.org/wiki/A9.com

• johndfsgdgdfg 5y ago
  Oh thank you. We should definitely promote this more.
  • google234123 5y ago
    It died in 2008 - it's now just the search engine on Amazon.com Feel free to promote Amazon :) Prime is pretty good