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Catalytic Converter 2008 Cayenne Turbo- Anyone Selling?

I ran the codes after the checking light came on
and got the dreaded message:

“P0421-Upper limit valve warm up catalyst efficiency below threshold Bank 1”

Vehicle: 2008 Cayenne Turbo (Overland)

I would like to believe it’s issues with the wire harness or just in need of replacing the 02 sensor but I’m preparing for the worse. Not trying to crack the bank with the catalytic converter but if I do, any recommend places to search? Did my due diligence and went through FCP Euro, Autohaus AZ, EBay, etc.

Rock Auto can make you them for a couple hundred+