How much can I expect a lawyer to charge to write a letter on my behalf?

I am a small business owner and I’ve got a customer who refuses to pay for services rendered. The customer and I both signed a contract, so she was well aware of the price. She’s been delaying payment for several months, putting me under increasing financial strain.

I know lawyer’s fees probably vary by location, experience, etc.

But as a ballpark, what do you think I could expect to pay for a lawyer to write a letter to the customer on my behalf?
What kind of fees could I expect for a consultation?