Find local Discord servers with bots and people tracking stocks and sales going on. Within less than a week, you should be able to get your hands on one.
Yes, it's absolutely stupid to have to commit to this for a full week to just be able to buy a console.
I managed to buy a PS5 for MSRP-ish. I bought the console for 599€ and it came with a "free" second DualSense controller. The PS5 itself is 529€ and a controller is 70€.
There's deal alerts, specials at various retailers with a subscription like Walmart. You just have to continuously try and change up your game if it doesnt work.