Is there a way i can make my car speakers blutooth?

I drive a 2007 nissian altima, and i've gone through 2 AUX cords in the past year already. I was wondering if there was something the you could buy that would work like that an aux cord but it'd would connect wirelessly through blutooth to my iPhone 5s. I don't want anything crazy expensive.

It will be crazy expensive. Replace the cord and quit breaking them.