I just bought a nice set for my GTO, made from the same material as the actual carpet in the car. They are manufactured by ACC (Auto Custom Carpet). They are available with/without a logo and fit the car nicely.
I can dig out the info for the lady I bought them from. I got them at Carlisle, but she is based in N Carolina IIRC. Customer service was great, and I had them very quick (about 5-6 days).