Whether it's a steal or not depends on what shape these are in.
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It's Ebay.
Those keys came from my parted out $10 M13. That condition is about what to expect on the lower end of M13 black keys. Now if I could find a spare gray left shift key and a blank/black S key, it'd be in less sorry shape.
Is there any particular reason you quote my handiwork, Ripster? I am just surprised(pleasantly) to see you quote my Hackwriter. Find a wheelwriter keyboard, a parts-grade M13, boltmod it, make a USB controller for it, make a minimalistic case for it, and assemble. Then you have your own to show in Geekhack.