Unfortunately, there are no remaining 1x123 or 2x123 bodies. Several people still build heads and offer them in the BST forum from time to time. You can occasionally find a body for sale, but it's probably easier and cheaper to just buy a Surfire E series.
That's a shame. I'd want a complete unit (I've got something very specific in mind). Any word on if there will ever be another run? Or more Mclux DIY Body parts?
I've seen the super sexy PR-T heads in the BST forum and I've got a strong desire to purchase one...