The HQ of the Air Intelligence Agency at Lackland AFB has an AQM-34L on display. It is located at Security Hill, at the entrance of Ardisana Hall (Building 2000). It's unclear whether or not that location is accessible for the general public. The Firebee was unveiled in January 2000, and its serial number is 69-6156. This newsletter and this history page (through the Wayback Machine) contain some details.
In 2007, the first publicized photo was found on the internet: an extensive photo report on Lackland aircraft by Brad Pilgrim contained one of the AQM-34L. Since the photo set appears to have gone missing, the AQM-34L photo is reproduced here.