Suntor is a hub manufacturer who has been best known for their coaster-brakes. They are easily modified to work as a regular Freecoaster. However, in recent years, their coaster brakes have been used primarily as a starter Freecoaster. They are easily available and cost much less than some of the newer BMX-specific free-coasters. Some people have been able to make them run very well. Some people have come up with some creative modifications to them. I would recommend that you choose either this one or the Taska as your first coaster, so you can decide whether or not coasters are for you.

Please negate the comment in red until I have the time to edit the photo, but here is the assembly of the coaster hub...