I haven't seen one, but, dude, my rechargeable lasts for like a month between charges. I never take the charger when I travel, just make sure it's charged overnight before leaving.
Or, if your current electric razor uses a wall wart (transformer that plugs directly into the socket) with a standard plug, take it down to Radio Shack and get a 12V transformer that has the same output and plug.
If it doesn't use a standard plug, and you have some extremely basic electrical skills, get a 12V transformer with the proper output, and some in-line connectors (male and female) so that you can switch the power cord over from the 110V transformer to the 12V transformer.
Make sure the 12V transformer will handle the wattage, not just the correct voltage output.