That particular piece is an out-of-production collector's item ... you're not going to find it wholesale anywhere; just varying degrees of expensive.
Consensus in the Lego nerd community is that it's not even a great investment because of its huge production run (seven years, much longer than most of the collector edition Lego sets) and other considerations -- so right now, there's basically a price bulge because of the new SW film, but whether the sets will be fetching the same prices in six months to a year is open to debate.
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Frank