I found some 67's on ebay from ge, eiko, phillips, roadpro and a slew of generic brands. I think i'll buy a box of ten for myself.
http://cgi.ebay.com/Roadpro-RP-67-Heavy-Duty-Automotive-Replacement-Bulbs-/170636115085?pt=LH_DefaultDomain_0&hash=item27bab47c8d
http://cgi.ebay.com/ebaymotors/Professional-Grade-Miniture-Bulbs-67-Great-Deal-_W0QQcmdZViewItemQQhashZitem2a03889d37QQitemZ180447911223QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
http://cgi.ebay.com/ebaymotors/67-Miniature-Light-bulbs-Box-10-13-5-Volt-Amp-_W0QQcmdZViewItemQQhashZitem20a9c2ac91QQitemZ140287061137QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
this ebay listing has some crazy cross reference for that bulb.
http://cgi.ebay.com/ebaymotors/Eiko-67-40845-Light-Bulb-Qty-10-NIB-_W0QQcmdZViewItemQQhashZitem3a4a39a96bQQitemZ250353396075QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories