price for upgrade from 12 Pro to 20?

I can't find the upgrade price anywhere without entering the key for 12. I purchased a key card for 12 on 12/1, but haven't scratched off the number yet because I'm trying to figure out what to do.

I originally was looking on here, when 12 was still up and there was a free upgrade. I thought the upgrade was going to come out later than a few days. Then, I saw a good price for 12 somewhere else (plus I had some points), so I got that. It took a while to get to me, and in the meantime 20 came out and the website was changed. It may have even changed again, since I don't even see the possibility to buy 12 with the free upgrade, which if I'm remembering correctly, was still there the last time I looked.

So it's either return the version I got, and buy straight 20, or keep 12 and buy an upgrade. Can somebody tell me what the price is?