For those who are having trouble finding them:
The 2313 PIC is no longer being carried by digikey or mouser, but
there are still some available.
Project-parts.com (http://www.project-parts.com/home.php) claims to
have 891 in stock, and is currently charging $2 each (less in
quantity). They wanted $5 s&h to send one to Michigan. I haven't
ordered one yet, so I don't know how quickly they respond.
David