Ask for a hot towel shave, thats how it should be shaved with a razor. Alot of barbers use a electric shaver, if youre looking for an old school razor shave ask fir a hit towel shave
its common in black barber shops to use a straight razor to shave your head.. especially in the south.
if this is what you want, just call any black barber in your area and ask.
i had it done once just to see what it was like... barber used a old school "open razor" hot towel, the works. it was cool but I can pay for it when i can do it for free... try it though, its cool