Give your techs the leftovers.
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OK, let me start this by stating, I personally have never purchased a computer with my own money. No joke, NEVER. I have been in this industry since 1988, using them since I was a child, and I can say without exception never. How you may ask, well, I consider it obligation of my employer to furnish me with the tools that I need. Before that it was my father that loved technology and provided me with whatever may spark my interest.
While I was starting out, I had many very kind managers that gave me surplus equipment. Servers, desktops, and even laptops. That idea has trickled to me. I try to provide same to tech that I deal with. Why? Not just to be a good guy. I do so they will learn. They will take a worthless server/desktop home and spend hours installing, fixing, playing, and most importantly learning. Giving them the leftovers cost me nothing, the company nothing (some exceptions apply. Talk to your finance dept) and builds the relationship, loyalty, and skills of the techs working under you.
So, while the discussion of how to dispose of old equipment comes up often enough on this site, I offer this as a possible solution. Please give to your jr. techs first. They will love you for it, and you will get more in return.