New Exterior Door Resizing Questions

[nedjinski]

I have a house built in 1955.

I want to replace the front door and notice that it is not a standard size - it is 35 5/8 x 79 1/2.

The new doors I have looked at are all exact sizes (36x80) etc.

What's going to be the best way to cut down a new door? take it to a milling shop?

Or am I going to have to entirely replace the casing to get the new size to fit?

Is this a typical situation?

 

[heretoday]

Do you have any shops in the area that you live in that might handle recycled construction bits and pieces? I'm thinking that someone with a house built around that same time (and there was a lot of construction being done in the mid-50s) may have gutted a similar structure and the doors might still be available. Just a thought, good luck.