Two Different Auctions for M's both BIN OBO. Shipped prices $43 and $59

[E TwentyNine]

The $43 1391401 only ships US and has a pending offer.  If you want to grab it, do so quickly:

http://www.ebay.com/itm/IBM-Vintage-Model-M-Clicky-Mechanical-Keyboard-1984-Pit-F2-Part-1391401-/121255164719

The $59 1398609 ships US for that price and worldwide for more.  This has the larger AT connector (ps/2 is simple cheap passthru adapter):

http://www.ebay.com/itm/IBM-AT-Keyboard-1398609-/261375828435

This second one is from recycled goods which has been known to sell for lower offers lately.

EDIT:  I'm not certain this second one is a buckling spring keyboard.  Part number seems about right, but no search with the number reveals much yet.

EDIT2: Speaking of lower prices, going to the recycled goods website, they have the same keyboard there.  For $35 + around $10-$13 shipping US (or you can pick up if near Ventura, California):

http://www.recycledgoods.com/product/7729-ibm-1398609-at-keyboard

[berserkfan]

You neglected to mention something important:

for parts or not working.

[E TwentyNine]

You neglected to mention something important:

for parts or not working.

Valid point, but when looking at old keyboards I tend to not even see that phrase as even when most people say "tested" they follow up with "but sold as-is".

Except for the people who do refurbs.

[Aer Fixus]

You neglected to mention something important:

for parts or not working.

They labeled it as from 1984. They likely have not tested it, or they tried through a non-compatible USB converter. I usually ignore "parts or not working" unless they say "tested and for parts or not working." Even then, they could have tested it wrong: wrong USB converter, hot swapping PS2, etc. If they actually have tested it, they'll usually use descriptors to indicate how it doesn't work.