I read somewhere that Brill's Content Magazine did an article,
including an interview, on Kevin Trudeau, the Mega Memory infomercial
guru and conman.

I’m fascinated by conmen, so I’d like to read it, but apparently
Brill's is now out of print.

Where can I find an online reprint of this article?

Hi markabe-ga,

Thanks for your question.

The article in question seems to be "King of the Pitch," by Katherine
Rossman. "Brill's Content," Issue June 1999.
http://web.archive.org/web/19990922005908/http://www.brillscontent.com/features/infomercial_0699.html

I was able to access it by using the Wayback Machine from the Internet
Archive (a great site that takes snapshots of webpages so that you can
see how a particular web site evolved) at http://www.archive.org

In case the link doesn't work, I'll explain how I got there so you can
access the piece. Go to http://www.archive.org and in the "Take Me
Back" box, enter: http://www.brillscontent.com/features/infomercial_0699.html
This will take you to the various snapshots of the page. Pick Sep 22,
1999.

I found the link at this page which also offered some other links
about Kevin Trudeau.
Kevin Trudeau
http://www.mazu.com/bizop/ktrudeau.html

Search strategy:
Google search:
brillscontent trudeau

I hope this answers your question. If you require additional
information, please ask for clarification and I'll do my best to
assist you.

Regards,
luciaphile-ga

I sent an email to a former Brill's journalist, and he couldn't get me
what you found. Great work.