Does anyone know a good online source where one could shop/price/buy complete or reasonably complete build kits for a touring bike?
There are lots of sources to by complete groupsets for road bikes -- all the Shimano, Campy, and SRAM groupsets seem to be available at discounted prices. And you can buy mountain bike groupsets as well (like Shimano XT or Shimano XTR kits).
But I haven't found a good place where someone has put together a set of components designed for a touring bike that one could buy (presumably at a discount vs. buying the components one by one).
For example, here is a set of mountain bike and road bike build kits from a custom builder, Curtlo. But I think these prices apply only if you get the frame.
And here's a nice kit builder from GVH Bikes, for road bikes
But I haven't found complete kits (or even touring-friendly groupsets) online.