Where can I get CPU/Mainboard combos?

I would check pricewatch under motherboard combos. I don't recommend them. You only save a few dollars, and get a limited warranty on the cpu. If you want to save some money, I would recommend one of newegg's refurbished motherboards. They come with a 30 day warranty and many have free shipping. With the money you save, you can afford a retail boxed cpu, which comes with a 3 year warranty. If you are an experienced builder, you can tell right away if there is a mobo problem. Newegg will handle any problems promptly.