Nixie Resources

Site 
https://nixieshop.com/index.htmlVery well done but packaged clock kits only. Ukraine based
http://www.neonixie.com/ http://allspectrum.com/store/nixie-tubes-accessories-c-26.html  Parts supplier 74141 $3.99/ea IN12 Sockets $2.99/ea IN12A & B tubes $10.00/ea 4 & 6 tube controller chips
http://tubes-store.comAll kinds of tubes, nixie limited IN12 sockets $2/ea IN12a&B tubes $10/ea IN15A & B tubes $2/ea Check this one out again
https://www.nixiediy.com/shop/ 
https://www.etsy.com/shop/NixieShopDotCom 
https://www.vacuumtubestore.com/tubes-categories/nixie-tubes 
https://nixietubesclock.com/ 
https://millclock.com/ 
https://www.shop-tes.com/display/nixie-tubes/ 
https://www.daliborfarny.com/ 
https://nixietester.com/Well designed, modular, but can get pricey Lots of Adruino support
https://TubeHobby.comWhere I got my clock from Limited selection Datasheets https://tubehobby.com/datasheets/in12.pdf
http://www.arduinix.com/Modular but limited to one style and Arduino Uno