Bob, the OL-1 arm(modded RB250) is available from any Origin Live dealer. I got my OL Silver from Galen Carol Audio in Texas, but there are a couple of OL dealers that advertise on this website, in the Audiogon classifieds under "Analog". The Heavyweight, you have to order from Expressimo Audio direct, and have to specify "OL model". The Rega stub is not the same. It's about $90.
No matter which model you select, you get the same bearing and motor/controller, so the heart of the lowest model is the same as the top-of-the-line. You can upgrade any model to the top model in any increment you want.
If you get this table, you will never need to buy another TT. In top model form, it is very close to the best of anything made, in performance. This value cannot be beat by anything in analog today.
There are only about 300, or so, of these TTs out there. They are very low production, and have no dealer network. You save money by dealing direct with the factory.
The fact that it looks great doesn't hurt any either.
There is a dealer on A'gon, that is a Shelter cartridge dealer as well as OL dealer. He is advertising on the Analog classified section. You can get the cartridge and the tonearm from him. He may even have the counterweight.