From our friend Cindy at Electronics Plus:
Lexmark 1398601 Model M PS/2 Keyboard (https://www.elecshopper.com/lexmark-1398601-model-m-ps-2-keyboard.html)
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(https://www.elecshopper.com/media/catalog/product/cache/1/image/1800x/040ec09b1e35df139433887a97daa66f/i/m/img_6680.jpg)
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(https://www.elecshopper.com/media/catalog/product/cache/1/image/1800x/040ec09b1e35df139433887a97daa66f/i/m/img_6682.jpg)
$50.00 + shipping. "Tested and complete, but not yet cleaned... An SDL to PS/2 cable will be included with your order."
That's a very good deal. I had mine done by Phosphorglow. Red Underlay and LED's.