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Everyone's having the same issue. I just got an error after attempting to order Performance. Now it's gone again (Tesla probably realized the technical difficulties and removed the configurator again to troubleshoot).
I ordered AWD last night. I too had difficulty putting my credit card number in on my PC using the Chrome browser, so I switched to my iphone and was able to finish the order successfully. Good luck!
THe AWD option showed up yesterday and I saw it was $5000. Up to 12 weeks delivery time.
For some reason I no longer can see this option in my configuration though!