Source for 03 Envoy AC parts?

I have an 03 Envoy (5.3L) with rear air, still warm here in AZ and my AC went out last week. Took it into my local shop today and they took a look at the end of the day so I'll get more details tomorrow but it looks like it needs several components;
* Condensor
* Manifold lines
* Accumulator with Evac

It was late and he was not able to get definite pricing but it looked to be north of $1500 which I am hoping to avoid. I have a buddy that bought a compressor kit for a Sierra on eBay and had it installed at a fraction of the cost. It appears I do not need a compressor but would like to find a cheaper online source for some components and like he did, find a cheaper mechanic to install it.

Any leads on a source for AC components?

Have you checked with www.rockauto.com (http://www.rockauto.com)?