The gene bank database is located at

www2.ncbi.nlm.nih.gov/cgi-bin/genbank

There you can design your target probes and check whether they have any
significant homology with other sequences that may be present.

When you are happy with your probe, order them from LIFE TECHNOLOGIES, Inc,
 at 

www.lifetech.com

9800 Medical Center Drive
Post Office Box 6482
Rockville, MD 20849-6482, USA
1-800-338-5772

Hope this helps

Alex Szabo