My advice is,"Don't bother!" For a start, it is not a case of just buying a bulb and popping it into a socket. It is not something the owner can do...unless, I suppose, you are an electrical technician of some sort.
I bought one and it came with part of the plastic base weighing about three ounces broken through. Did I just have to send that back? Oh, no! I had to repack the entire thing and send it all. Fair enough, I got a replacement and was just getting used to cooking with it, when the bulb/element blew. I decided to return it and ask for my money back. Clearly, these things are of poor quality for one reason or another.
Of course, you will almost certainly get someone else here replying that they are the finest thing since sliced bread. If you're a gamblin' gal, go for it, but my advice if you do is...don't throw the packaging away!