What is the best way to have an entire collection of Mozart's Symphonies without breaking the bank?

Right now I’m searching iTunes for Mozart’s Symphonies starting from his first to his very last. I don’t intend to get them all at once. I just would like to have a practical and prudent system of eventually acquiring all of them without spending money wastefully.

Have you ever done anything like this? How did you go about doing it? Buying a CD is not an option for me as I got used to iTunes purchasing, then burning them to CDs myself. Yet, would this truly be the best way to go about it? Thanks! : )