chattanooga

What is the best place to buy car audio gear in Chattanooga? Also looking for the cheapest place.

If I was looking for a custom ported enclosure for a single 12 inch subwoofer (don't know which one yet), what is an average price for a decent one? I live in Chattanooga, TN btw. I'm gonna be building a system in the future and I want to be looking at options. It's probably gonna be around 500...