I have now concluded that Radio Shack is worthless as a supplier of plugs and sockets. This has been confirmed by numerous visits and from frustrated clients.

PST stocks professional grade plugs and sockets for all types of timing applications and we deal with electronics suppliers that stock parts as well.

Do not bother going to Radio Shack except for batteries and the occasional cable.

Fred - The one good thing I found there was a USB to serial cable that works, is easy to install and available when you suddenly need one out in the boonies