I am looking for someone who can do custom silkscreening for
low-volume (less than five) shirts. I have been using iron-ons, and
they are simply unacceptable, they peel off, etc.

I have the designs in electronic form already made. Very simple
designs-- just text in a specific font. 1-color only (white text on
black shirt). Looking for a business or hobbyist who could do this
for say, around $50 (plus material costs of course)? Is that at all
possible?