why does the model of phone matter if they're all micro usb cables?
edit: if you can cut and resolder that cable and reclip the housing, or buy new housing for you mini end, I see no reason not to do this.
the reason people pay more is A) they don't have the materials b) they'd rather pay than make it themselves.
if you're buying individual pieces to craft your own cables you have to make more than a few before you save any money.