Follow Twitter accounts that’ll tell you when they’re in stock at different places. @GYXdeals, @kinnynet, and @PS5StockAlerts were all ones that I followed. It’s also good to have accounts at multiple retailer websites with your address and billing info already on your account to making checking out faster. Having your address and credit card info saved to your browser also helped me get a ps5 from antonline since that website doesn’t have accounts. There’s twitch streamers (such as killercam1020) with stock checker programs running that you can watch, or leave on your computer that’ll alert you when there’s stock. Last thing I got is that with those streamers they also normally have discord servers that can help.