I WOULD LIKE TO FIND THE WORST AND STRONGEST FOUL ODOR AVAILABLE FOR
PURCHASE ON LINE PLEASE.

alvarez469-ga,

I've read the Comments you've received so far, and I'm convinced that
without a doubt, I've got your ultimate Answer.

The most foul, horrible, disgusting-smelling odor I've ever smelled
came from a chemical compound known as "Putrescine." (Note the root of
the word, "putrid" in the name).

This is the exact chemical compound produced by the rotting of animal
flesh, and it smells just like it. See the following link for more
information, from Wikipedia:

http://www.wikipedia.org/wiki/Putrescine

"Putrescine (sometimes spelled putrescin or putrescene) is an organic
chemical compound C4H12N2 (1,4-diaminobutane or butanediamine) formed
by and having the smell of rotting flesh. It is related to cadaverine;
both are produced by the breakdown of amino acids in living and dead
organisms."

Once I came across a can of Putrescine in a college lab chemical
storage freezer, and my friend could not resist the temptation to open
the canister to smell it. He did, and promptly vomited on the spot.

You can buy some online here 

http://www.apolloscientific.co.uk/products/lifescience/otherProducts_Lifesciences_Putrescine.htm
,

through Apollo Scientific Limited, but I strongly urge you not to if
you're just looking for a practical joke/gag type of thing.

Google search strategy:
Keywords:
"putrescine":
://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&safe=off&q=putrescine&spell=1
,

"putrescine order":
://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&safe=off&q=putrescine+order&btnG=Google+Search

I (don't really) hope this helps! Good luck in continuing your
inquiries!

Sincerely,

omniscientbeing-ga
Google Answers Researcher

A couple of possibilities are hydrogen sulphide (which smells like
rotten eggs) and methyl mercaptan (which has a skunk-like odor).

My son Alexander's sneakers - guaranteed to scare roaches, rats, small
children, werewolves and vampires at 10 paces.  Certified toxic and
malodorous.

I'll pay you to take them. ;) 

--Missy

Hello alvarez469-ga,

You might be interested to know that the US military is interested in
your mission of finding the “worst and strongest foul odor” and has
developed materials to fell crowds. I have no idea why you need these
products or where you can get them but the stories of the military’s
"Ultimate Stink Bomb" will help you define the qualities you’re
looking for.

U.S. Military Is Seeking Ultimate "Stink Bomb"

---------------------------------------------------
http://www.diodon349.com/Stories/General/Pentagon_Investigates_Stench_Warfare.htm
July 05, 2001 -- Pentagon Investigates 'Stench Warfare'

London (CNSNews.com) - The Pentagon is developing the ultimate "stink
bomb" - a harmless weapon aimed at clearing hostile mobs or driving
away enemy troops with a stench so foul it will provoke not just
repugnance but fear.
Dalton, a cognitive psychologist, found two odors that appeared to
offend irrespective of culture and ethnicity, the magazine reported.

The first smell, called U.S. Government Standard Bathroom Malodor, is
a smell created to test the effectiveness of deodorizing cleaning
products.

"It's very pungent," said Dalton. "More precisely, it smells like
s***, but much, much stronger. It fills your head. It gets to you in
ways that are unimaginable."

So awful was the smell some volunteers began to scream and curse
within seconds of exposure. Although it was harmless, everyone
expressed the view that it would damage their health.

The second stench was a sulphur-based one approximating the smell of
rotting carcasses or food.

http://www.wasteage.com/ar/waste_stink_bombs_away/ 
http://news.nationalgeographic.com/news/2002/01/0107_020107TVstinkbomb.html
http://abcnews.go.com/sections/world/DailyNews/stink010705.html
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While searching, I came across this irresistible item.
http://www.globalideasbank.org/reinv/RIS-26.HTML
Anti-rape stink bomb in bra

Good luck.

czh