Where online to get inexpensive carders? I've not even been able to find the wire replacement pads for anything inexpensive.
Oh, a drop spindle made of a CD may not weigh enough to spin thicker yarns, you could try it but it might be frustrating. If you have a big hole saw type drillbit, you can cut drop spindle sized disks out of bits of wood. The disks will even have a nice hole in the center to put a chopstick in. Or a bit of dowel. I got some scraps of local hardwoods, monkeypod and koa, from a furniture maker who lives in our neighborhood to make drop spindles with. They are a little heavier than if they would have been made with a CD and are a great weight for spinning yarns instead of thread. At the moment the only fiber I have is angora but I may be able to get some sheep's wool soon. It's supposed to have a bigger crimp and be easier to spin.