I used this app called "TrackaLacker." I had been really struggling to find anyone that would sell me a PS5 Pro, and this app saved the day. I signed up for the paid "ultra" plan which had a week-long free trial, and I managed to order mine the day after starting the subscription through GameStop. The app notified me that GameStop had gotten a restock, and tapping the notification brought me straight to the PS5 Pro on GameStop's website where I was able to check out in a matter of seconds with Apple Pay; didn't need to enter any of my card details or address for the purchase in doing so. This isn't an ad; it's just what worked for me, and I hope others that might be struggling can attain the relief I got from this app. I already ended my free trial for TrackaLacker, but I honestly feel like I owe them $25 for mediating this so I could snag the console so late into the game. We all should've bought this console 1+ month(s) ago lol
Edit: Also wanted to mention that, the first few notifications I got about restocks didn't work because they had already sold out, but I think it was the fifth notification where I got lucky and was able to get there in time. I really suggest using Apple Pay because that made the checkout process lightning fast, which seems to be essential for snagging these Pro consoles