On Mon, 03 Sep 2007 12:39:05 -0000 in sci.electronics.basics, leroi2007
<leroi.2007@gmail.com> wrote,
>http://www.add2bestbuy.com//catalog/Encyclopedia-of-RF-and-Microwav

None of the newsgroups in the sci.electronics.* hierarchy are
intended for buying and selling. An obvious giveaway is that none
of them have "forsale" or "marketplace" in their name.

See Mark Zenier's guide to the hierarchy, at
ftp://ftp.eskimo.com/u/m/mzenier/seguide9706.txt

When sci.electronics was split back in '95, an associated newsgroup
was created for buying and selling:
misc.industry.electronics.marketplace