They have excellent prices in cabling, in-wall speakers, and everything you'll need. It's not top quality, but decent quality like you said you were looking for.

If you're handy at all, this might be a project you could tackle on your own after watching a few YouTube videos. I'll bet there are websites that will help you design it too.

But if you'd rather have a sound guy or electrician do it, your best bet would be to call them and get an idea of the components you need. They may have good sources to get discounted pieces, or maybe you're better buying them yourself from Monoprice.com