Never, ever negotiate on price and devalue your work. Negotiate on quantity if you must, but not to such a small quantity that its not worth turning on the oven.
I'd like to order 12 large decorated cookies.
Sure, they're $3 each. When would you like to pick them up?
Oh I can't afford that much? Can you just make 3?
No, the minimum order is 1 doz. I'm sorry I won't be able to help you, but you should call (insert the name of the most expensive bakery in...