I bought one through CSUSA with several interchangable tips at a show sometime back. I use the fine point tip to sign my work, and have played some with other ideas but only on scraps. Not sure of the brand and it's not with me right now (I'm killing time at my real job), but it does have a buffalo on the front of it. There are several of them out there with the interchangable tips that use a standard plug. If you can't find one on woodturning sites you may look at woodcarver's supply places, they use them a lot more than woodturners.
Originally a lot of people used what looked like an old soldering iron, you probably remember those from being a kid at Christmas. Today most of the real ones have a power pack the iron itself is connected to it by a small wire. Much easier to use than those old ones, most even have adjustable heat depending on the tip and the type of wood.