I know it is too late now, but for the next time. Hopefully this might also help with some other online ordering locations as well. I hope this helps some of you guys end your quest.

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Here is what I did to get to the checkout and through it while the bundles where still available:

I had two windows open on the same browser. Both logged in and on the same PS5 Console. While going through the order, when one would lock up I started refreshing and trying in the other window. Rinse and repeat until one of them went though.

I had to do this at every step; adding to cart, getting to the cart, going to checkout, confirming payment. It would lock up and I would jump to the other window and refresh and keep trying tell it went through in one of the two.

I would do things like, when on window A it says "Item in your cart", immediately switch to window B and jump into the cart. Then go back to window A and click "view your cart". Then which ever window gets there first by going through two different links, start the next step. Which ever screen didn't make it, I would copy the address from the working one and past it into the one that's still loading and start refreshing.

That way if one wasn't frozen just processing it wouldn't interrupt it, but if it was frozen I was still moving the order forward. Since frozen and processing look exactly the same I was able to avoid both waiting on a frozen screen and interrupting a screen that was taking it's sweet time to load.

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It worked for me, I hope it helps some one else as well.