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Amazon is currently selling the segate 2 TB drive for under 100.00, which considering that the comparable WD green drive is selling for 169.99, 100.00 is quite a steal.
http://www.amazon.com/gp/product/B004CCS266/ref=oh_o00_s00_i01_details
You are limited however to only buying one at a time.
Good price considering the current HDD situation because of the Thailand floods. I bought a couple of these for my NAS about six months ago and have nothing but good things to say about them for use in a server or NAS configuration.