Fallout 4 has been out for nearly a month now, but if you're still disappointed about not being able to buy one of those Pip-Boy sets before they sold out (often within minutes), you're in luck: Amazon currently has the Pip-Boy Edition back in stock for Fallout 4 on Windows PC.
The package will set you back $119.99 plus tax, but shipping is free with Amazon Prime. There's no promise that this won't sell out just as quickly as previous re-stockings have, so if you're still attached to the idea of your own Pip-Boy, you should act fast.
Update: The PlayStation 4 and Xbox One versions of the game with accompanying Pip-Boy are back in stock now, too. They'll run you $119.99, as well, if you can grab them in time.