Getty Images Julia Beck, 53, regularly visits the same salon for a blowout of her hair. When the economy tightened, she didn’t want to lose this small luxury but needed a break on the price. She asked the salon: “What if I agreed to get my hair done on a weekly basis. Do you think I could get a better rate?” The answer: a 20% discount on the price. Think bigger than negotiating for cars and houses. Beck and consumers like her have discovered that you can negotiate a better price for just about any product or service. “Your cable bill, cellphone bill, credit card interest rate and ev...