I have compiled a list of sources for the elements that are available to the amateur chemist. Dysprosium will be discussed here.
Dysprosium is one of the less reactive rare earth metals. Its compounds are trivalent and generally colorless, although the soluble compounds supposedly have a yellow solution. Dysprosium is quite a boring rare earth metal.
In element form: Dysprosium alloys are used on many hard disk platters. Terfenol-D, the alloy in a Soundbug(r), contains dysprosium metal.
In compound form: No sources found.
Here is my sample of dysprosium. It is a hard disk platter.