http://www.pwcca.org/index.html is a good place to start when looking for a corgi in your area.
we also have several good thread on what to look for in a puppy, feeding, potty training, etc. - click on the FORUMS button at the top of the page.
also you may be interested in reading Foxys Story & My Pet Store Experience threads that are being discussed right now * oh I forgot to mention check out Dewey's thread - there is a lot of information and discussion on your question there too!
good luck and keep us posted on your progress
*edited to add Dewey's thread