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I do not know of any, I did spent a few weeks looking for a Nixie Tube Clock kit and found these to be a reliable quality source at a competitive price. I could have saved a few ($10-20?) dollars less on eBay from Asian providers, or buy the tubes separately, but decided not to chance it and opted to go for the well prepared instructors, pre-flashed microcontroller and support available from these guys.
One thing to pay attention to is to ensure the Nixie Tube is connect via a socket, so you can replace the Nixie Tube in a matter of minutes without soldering. I would hate to damage the clock replacing tubes in the future.
That said, if you find an alternative please share it with us.
Example: This one is a little less expensive but the PCB layout very different and I felt it wouldn't have ended up looking as good. https://www.ebay.com/itm/Nixie-Tube-clock-KIT-with-IN-12-LED-Alarm-Black-/172319700960