There's been one on Ebay for Buy It Now $1,000 or Best Offer for a long time (gone now). Could have been the same book, with the seller trying a different approach. He rejected a $600 offer from me 2 months ago. Given the recent auction results though, I'm surprised it even went as far as $799 to be honest.
David, my friend has 3 unpublished manuscripts from the 60's and he is looking for a buyer