A little package arrived from Russia this afternoon, containing a dozen ИН-16 "Nixie tubes":
Now I need to find a decent electronic components shop (since Radio Shack decided it was no longer worth their while), and build a transformer to convert wall power to 180VDC. And then build a tester to make sure all the tubes work.
And THEN I need to learn enough electronics to build a computer interface to drive the little buggers via a serial port (or even USB, if I can manage it).