I was able to snag a Model M off ebay for 25 dollars shipped! I purchased it not knowing the model number or condition. I had been watching this
listing and missed out on throwing a bid at it. I really didn't want the "CPU" as it has a blown HHD and power supply. I figured it might be worth it just for the keyboard itself. After the auction ended I noticed it went unsold. A sent off a msg to the seller and offered 25 for the keyboard. He bit. I got the keyboard in 2 days and it is a mint '91 Model M 1391401, The cord is perfect and the case and keys cleaned up like new.
I checked today and he had
relisted the computer without the keyboard at the same price.
All's fair in love and eBay.