most 3d printers have all parts designed around the dimension of a nema 17, to change it is a big job
Look around your area for computer and printer recyclers, bigger places that are user friendly.
BUT know what your after
nema 17 only defines the X and Y dimensions
It doesn’t define the length or the strength, or the size of the mounting holes or even bipolar vs unipolar, or spindle size, not to mention the electrical characteristics
see [
reprap.org]