It's very good timing for anybody that fancies one...because it's just been re-issued. [with a few revisions to aid playability and stability of the neck joint...but still essentially true to the original specs]. The various interchangable pickups are being nnade available again too by Dan Armstrong's son,Kent.]
Prior to this, originals were very scarce and the easier to find coppies weren't always up to much or very faithful to the unique design features.
And I can vouch for Kent Armstrong's pickups having fitted them to several guitars. The only cost £40 each compared with maybe £100 for seymore duncan of similar quality. The guys at WD music (UK) are very helpful too.
I can vouch for Ishibashi Music. I bought a Telecaster from them a few months and they have excellent customer service and the guitar srrived within a few days or ordering.