Since you are in the States, you have some options.
Check out clubfinders.com or Callawaypreowned.com
In each case, you need to click through a few filters, but they are places where you have a fighting chance. In the case of Club Finders, you can leave a note to be informed if/when what you are looking for comes in.
And probably needless to say, there's always Ebay.
Good Luck!