Arbitrage -
You didn't mention whether this is an HA pair or single controller.
Nor was there mention of licenses and support.
You could run a search on Ebay and find some prices, but be wary of support/license issues...
I hope this response has been helpful to you.
At your service,
Eugene E. Kashpureff, Sr.
Independent NetApp Consultant http://www.linkedin.com/in/eugenekashpureff
Senior NetApp Instructor, FastLane US http://www.fastlaneus.com/
(P.S. I appreciate 'kudos' on any helpful posts.)