Yes, they are a bit expensive initially. However, they end up being a lot cheaper than buying needles sizes separately and you almost always have the size you need. Unless you have multiple projects like many of us do and then you need to buy more tips and cables.
Deann, please ask your questions in a new thread if you haven't already. The original thread will get all cluttered up with answers and the original poster won't be able to find the answers from people responding to her question.