Doors and Windows - custom height basement entry door

hello all.
i am in the process of finishing a basement and am thinking about installing an entry door. after installing a header the greatest height i can make the rough opening would be about 75 inches. i know it is possible to buy many custom size entry doors, but 95% of these that i have found are extremely expensive solid wood decorative entry doors. i'm just wondering if anyone can point me in the direction to find where i can get a custom size plain-jane fiberglass or steel entry door, preferably on the cheaper side? a top-lite would be nice, but not necessary. thank you-

also, am quite experienced in finish work, but am trying my hand at framing in this endeavor. am installing windows and hopefully the entry door into a cement block basement. i was planning on cutting the rough openings with a concrete saw, a lil clean-up with a grinder, filling any voids in the block with concrete, and then installing my framing with a good amount of liquid nails and a powder-actuated gun. is this the best way to go about this?

Mobile doors are normally 76" in height, don't know if you can find that extra inch.

You could buy a wood door and cut it down to fit. Be sure to paint it well including the top and bottom edge!

also, am quite experienced in finish work, but am trying my hand at framing in this endeavor. am installing windows and hopefully the entry door into a cement block basement. i was planning on cutting the rough openings with a concrete saw, a lil clean-up with a grinder, filling any voids in the block with concrete, and then installing my framing with a good amount of liquid nails and a powder-actuated gun. is this the best way to go about this?

Looks like you forgot a concrete lintel or just didn't mention it here. I would get a blank solid core 6 panel wooden door and under or over and under cut that. problem solved