Is 5ft wide worth the extra cost

Is the extra 1 ft worth the extra cost and how much of a price difference does it actually make.
All I can find is 4x8 so I will have to make my own 5 ft wide plywood for the floor, front, back, and top.
All I can find is 4x8 so I will have to make my own 5 ft wide plywood for the floor, front, back, and top.