Where can I find out where to purchase a USTOUR T320 Metal 24 degree
club with a Extreme aluminum carbon shaft?

Hello and thank you for your question.

The US Tour T320 (an off-brand version of the Taylor 320 line) is listed at
http://www.golfcrafters.com/clone-knockoff-woods-pg3.htm
Their website order process is currently off-line.
The contact information for Golfcrafters is 
Fax: 1-443-788-2477 
Sales Contact: sales@golfcrafters.com 
Customer Service: customerservice@golfcrafters.com 

May I suggest that you email them directly.

The club is also available in Ontario, Canada at
http://www.golf-tech.com/W-UST320.htm
 E-mail:  admin@golf-tech.com
          Tel: (905) 479-1796
          1-888-429-9974
 
 

I cannot confirm that the listed club in fact is a 24 degree
arrangement, but I believe we can assume that it is only manufactured
with one configuration, so that would have to be the one you are
looking for.  Similarly I believe that given that the seller offers
the choice between steel and graphite, the extreme aluminum carbon
that you seek must be the graphite club being sold at that site.

Search terms used
"US Tour" taylor 320

Thank you again for bringing us your question.

Sincerely,
Google Answers Researcher
Richard-ga