It cost me like $ 850.00 or less, I bought them from Bose directly. Same size speakers. As for the rear sub, I bought a new one from eBay. It was hard to find but it was worth it. Umm, as for installing it. The sub in the back was the easiest. I didnt replace the door handle speakers, those are good. I updated the door speakers, rear and sub.
The speakers alone for the front were like $ 120.00 and than other stuff added up. Taking the door panels off was hell. I was obsessed not to scuff the panels or anything.