If you have been (unsuccessfully) trying to find a PS4 in stock, you might try Walmart this Sunday! Starting at 8 am (your local time), the stores will begin to sell those that they have in stock. Even though they will be in the stores, there are still limited quantities available.
There is no confirmation if they will be available online at that time or not. You can also try your local Best Buy or Gamestop as these stores have also received shipments recently and you might still find one there (might be good to call ahead before you drive to the store).