I couldn't find any completed auctions for this machine on eBay, but I did find this current listing:
http://www.ebay.com/itm/Baby-Lock-Au...item51b4fec93e
That auction has 3+ days to go. You might want to watch it and see what it ultimately sells for.
Also, have you check reviews at
http://www.patternreview.com? To see older reviews, you need to establish an ID and login. Go to "sergers/sm" and Babylock, then scan down the list until you find the Audrey. These are all user reviews, and they often include the purchase price, date purchased, etc. in the review.