I would like to know where to purchase a quality reproduction of the
Tutankhamen Pectoral, a decorative piece of jewelry found on the chest
of King Tut in his tomb.  I cannot seem to find a merchant selling it.
 Do you
have any suggestions on where I might find a seller of such a
reproduction, including the seller-merchant's address and phone
number?

I've found several replicas of Tutankhamen pectorals on these sites:

http://www.kingtut.net/MM001.ASP?pageno=61

http://leipzigspy.tripod.com/JewelryDepartment.html

Some are offered at eBay:

http://search.stores.ebay.com/search/search.dll?sid=15504627&store=THE+EGYPT+STORE&colorid=6&fp=0&query=king+tut+pectoral&srchdesc=y

If any of these are suitable, I'll be glad to post an answer to your
question. If not, it would be very helpful if you could describe in
greater detail precisely what you need.

Add to Pink's findings: generalgifts.com sell a "Pectoral of kheper
scarab" as found in Tutankhamun's tomb at $9.99.
Find out more at 
<http://www.generalgifts.com/products/figurine_detail.asp?product_id=F5080>
(if the line breaks, try a search for Item number F5080)
email: <info@generalgifts.com>
tel: 1-626-330-8630
fax: 1-626-330-8640
General gifts also have a wholesale department if this is what you
want and how you want to purchase.

From the picture on-screen, it may be the same as the Scarab Necklace
pectoral (ref #JEW-008)on <http://www.kingtut.net/MM001.ASP?pageno=61>
- the page cited by pinkfreud - but kingtut.net's price is 150% more
than at generalgifts!  (It may of course be a better quality article
here, one cannot tell from the picture...)

Good luck in your search; if these aren't helpful replies, please give
more detail as to exactly what you need.