Yes, I got that driveshaft made at Dependable Driveshaft in Clearwater for about $225. It took about 3 days to make, and only needed to bring them my stock unit (which I got back and sold). It is a steel 1-piece made with Mustang rebuildable U-joints (stock Nissan are not rebuildable). It weighs about 15lbs. I replaced it with an Enjuku aluminum one that weighs 11lbs. The stock one weighs about 23lbs.

Just FYI, 350Z's have carbon driveshafts from the factory.