Cheapest would be pull on from a junk yard from the same length and approx year truck with the same transmission.

Better quality would be from your local driveshaft shop, but only if they will dynamically balance it. This is still relatively cheap, and new with no flaws.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-