Hello,
There is a Amiga 2000 HD in very good condition currently for sale on eBay as a auction, less than 2 days left.
Here is the link to the listing:
http://www.ebay.co.uk/itm/330954749905?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649This also comes with the original purchase receipt that made in December 1st 1989.
Please scroll down passing the payment/shipping policies for the description of the listing.
I have opened up the case and I can confirm that there are no corrosion on the motherboard but only a hint of it around the RGB ports as shown in the pictures.
Link to pictures of motherboard:
http://imageshack.us/g/32/0si7.jpg/I know I have forgotten something...nevermind!
Please do not hesitate to ask any questions or want more details/pictures etc and I will get back to you.