A friend of mine asked me a favor to find good online recourses that
could help him find good deals online so as to hunt for second-user
manufacturing equipment and/or production lines. He said he needs to
find some websites similar to goindustry.com to dig for what he?s
looking for. Totally clueless, I tried to Google for similar sites but
I got lost in a matter of seconds. Moreover, I feel that he really
needs to know a bit more about what he?s planning to do; so any kind
of information/resources on this subject would be quite helpful.

I?m obliged to grant my friend this favor, but my knowledge in this
field is close to none. My request is mainly for a list of the most
popular online recourses similar to the site I mentioned above.
However, any additional information or advice would be much
appreciated.

TIA