What is the most expensive tennis stringer?

Hi guys I was just curious to know what the most expensive tennis stringer is? Is it the baiardo or yonexs machine? Are there any other brands that cost more?
 
The babolat sensor expert is up there. Also, the older babolats like the 5502 were around 20k when they were first introduced in the 90s.
 
I hope Albert Lee chimes in on this thread, he's seen a LOT of machines in his time. I recall there being a dual tension head machine... wasn't it a Technifibre? Am I crazy???
 
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