Second link is the exact heating element they use in the Phedor... would recommend this unit as the tip of the element gets glowing red... others don't, depending on where they put it inside the ceramic. Also, it stays constant on... which you want... adjustables aren't the way to go. Simple & cheap.
Here is the Hakko cordless version, sells for $30:
Hakko FX-901 Cordless Soldering Iron
Mfr: AMERICAN Model: FX-901/P
FRYS.com #4302455 UPC: 641328045894
The HAKKO FX-901 is a lightweight, portable battery-operated soldering iron. Powered by four AA alkaline or nickel-metal hydride (Ni-MH) batteries, the FX-901 will operate above 600°F for up to 120 continuous minutes. No other battery-operated soldering iron can deliver so much power for so many continuous minutes. Other cordless soldering tools on the market spark, which can damage sensitive electronic components, and butane can ignite flammable vapors, causing serious injury or even death. But the FX-901 is safe. No spark and no flame.
I do have one question about that cordless thing I posted...not sure if it has a ceramic element, it doesn't mention a ceramic element in its description, so I'm not sure. Should probably confirm that before ordering.