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Good question - I ordered mine from precisionreloading.com and was happy with the service. It's been copied by others, but the best item (not copied) is the case holder - works great on an electric screw driver. Make sure you get the expander mandrels.
K&M has its own website, I have found them very helpful on the phone as well.
I suggest the ERGO Holder if you do alot, it is much easier on the hands.
You will need an Expander and mandrel for each cal you do, as you need to expand to the same diameter of the Mandrel you are going to use to get a good fit. The expanders are held in a press adapter.