can you tell me how much it would cost to upgrage 3x2C cameras(less than 1 year old) to the Pro version
This can be asked there :
I went to Eufy Security and clicked on the products and found them at the link below.
319 for 2 cams plus 129 for extra camera. If you get a referral from the referral program, you may be able to make that price go down.
I still find this funny in that the pet water fountain is part of the Eufy Security.