Have you used MyMathLab before?  Did you use it with the same book you are using now? You may not have to buy a new code!

1.  Log in with the same information you used in the previous course. 

2.  You should see something like this. 

Click "Enroll in Another Course"

3.  Type in the Course ID for your new class

4.  Spend the money you save wisely!