Le sigh, I know you're trying to be helpful after the fact, but it comes across as Captain Hindsight material for those that weren't able to get a system.

I was able to add the PS5 to my cart with the button at 12. It stayed in my cart the rest of the day, so all I had to do was refresh the cart page - I didn't click anything, I typed the link as you suggested. Cart page wouldn't load. Typed the address for the checkout process (which I had been to 4 times by 9p already, so I had it copy/pasted). Page wouldn't load.

After about 6-7 minutes, the checkout process page would load (after the colorful spinning circle of waiting), would accept my billing and CC info, would let me click "Place Order" at which point it would say it was out of stock.

I understand that you may have had a method that worked for you, but insisting that it would have (key: past tense) worked for us is a bit short sighted.

We tried, it didn't work. Again, congratulations on getting lucky.