Fallout 4 Pip-Boy Edition quickly sold out, and then Bethesda made a limited supply available, but there will be no more after the current supply runs out. The special edition features a copy of Fallout 4 in a custom Capsule Case, and an actual Pip-Boy wearable.
Pete Hines, PR and marketing executive at Bethesda, had a bad news confirmation for those still trying to get their hands on a Fallout 4 Pip-Boy Edition:
@hyliannelf this last allocation was the final one to all stores in all territories.- Pete Hines (@DCDeacon) June 25, 2015
It was nice of Bethesda to have additional units manufactured after an initial run - but there are just "only so many ways we can make and maintain a level of quality," as Bethesda doesn't own its own factories to get the job done.