Quoted from Atomicboy:
The last couple one ebay in fact went for around $1400-$1500 from what I recall.
Actually, they've never broken $1000 (I've been following these closely for the last year and have kept a comp record).
The most recent was this one (I just won it on Ebay for $865):
Here are the ones before that:
$860 - 4-3-11
$595 - 1-18-11 (opened; previously displayed on a wall)
$930 - 12-17-10
$670 - 10-10-10
While its great to finally have a perfect one, now that I took the plunge, I'd imagine $200-$300 reproductions are virtually guaranteed.