Update 8/14/13: Back on the market.
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For Sale: Original RED 300mm f2.8 PL mount lens (Imperial)
Excellent condition. This is the original version of the RPP 300mm. Optically they are exactly the same.
Check out this great post by Mark Toia on using the original 300mm with his Epic.
The original 300mm sold for $5750 new. The RPP 300mm is currently $5950 new or $3500 battle-tested.