Flash Sale from OneTesla. I really don't know why they didn't call it a "lightning sale" …. maybe Amazon has a trademark on that?
Previous sale description shamelessly copy-pasted:
A lot more expensive than the cheap little 'tesla coil' kits from China, but a lot more features, better design and support.
I bought the OneTeslaTS version late last year when they had a 20% discount after hunting around various other companies that do kits and/or reference designs.
High Voltage and somewhat difficult so definitely not recommended as your first electronics kit build. Get yourself some soldering and assembly practise first on some of the cheap kits that icstation posts here!
https://www.youtube.com/watch?v=BZZbe6rI4EE