You are correct, the extra shipping will add some cost. When bought in bulk, I get free shipping. One cam at a time is not bulk.
Here is some examples of polishing the journals. I have seen cam bearings destroyed after a replacement cam was used. I think it boils down to the journals being too coarse.
Not much material is removed, just enough to provide a smoother finish. I processed a few cams tonight in between machining bolt patterns into 25 valve covers. That CNC ROCKS! 1.36 minutes per valve cover (machine time). My old method on the Bridgeport, 20 minutes per cover.







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