Solid core doors (those with a wood chip core) have 1" thick splines on the sides, allowing you to cut as much as 1/2" from each side and still have enough real wood for the hinge screws to grab into. They're just like a hollow door, but filled. 80" tall by 26" wide is a standard off the shelf item, which you could then cut the 1/2" off each side.
Optionally, you could do the same with panel doors.
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