Greetings!

Here's a site: Printer Works . com. The specialize in refurbished and parts for various printer types. On a whim, I searched for a power supply for a LaserJet III, and came out with a few alternate part numbers for replacements, all of them under $50. Hope that helps... Note: I have never ordered from these folks, and I have no clue if they are reliable or not. At the very least, you might be able to get equivalent part numbers...
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Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs