I am also in the market.  I could commit to a order of at least the main modules. I've only been able to pick up a single 129/3 unit and am being patient for the rest to appear on the aftermarket.

I think the down turn-in sales has to do with a few things:
- the over-abundance of built in Vocoders (albeit lesser quality) in the late 90s/early 2000s machines
- the rise of DAW and autotune effects
- the comparatively low buy-in cost of Electrix Warp Factory on the aftermarket
- crappy economies

Perhaps the A129-1/2 could become a DIY kit   It would certainly reduce costs/time for Dieter but still maintain availability.