On eBay right now, Travis Bean with the serial number that is simply “1”. Cost? A mere $50,000US. If you plan on making the purchase, please let me know.

http://cgi.ebay.com/Travis-Bean-Artist-1-1974-Serial-number-1-Documented-/290509088397?pt=Guitar&hash=item43a3b0e68d#ht_22321wt_1884