I agree with much of the above advice. Find another way to express the value that you give and your expertise as a stringer.
My local big box store offers PSGD@$20 and stringing labor only @$12!
I have had to find another way.
I stock reels of Sweet16, OGSM17, MCS, SPPP16L, and BHBR17 plus a few specialty strings and I tell them that MY strings are better than the strings at the store at a competitive price with a quicker turnaround and more consistent quality.
Things are tough here in Vegas!
BTW If you are THAT meticulous; spell it right!