I would be looking at refurbished work stations. Cheapest thing you can find with a pcie video card slot.
Alternatively, after I filled all the PCs I had at home, what I did was buy just a card + PSU and slap it in my parents computer
I set the priority on the process real low. -F160. Out of the deal they get a more responsive computer capable of HD video and games. I can VNC in to control it and fix it whenever they call me "The printer doesn't work" etc... Their power rate is also dirt cheap compared to mine. Givin em a chip and mobo as soon as I can find a heatsink bracket for it too. Wont increase hash rate but if I'm using a few bucks in electricity every month it's only fair.
Alternatively, after I filled all the PCs I had at home, what I did was buy just a card + PSU and slap it in my parents computer
I set the priority on the process real low. -F160. Out of the deal they get a more responsive computer capable of HD video and games. I can VNC in to control it and fix it whenever they call me "The printer doesn't work" etc... Their power rate is also dirt cheap compared to mine. Givin em a chip and mobo as soon as I can find a heatsink bracket for it too. Wont increase hash rate but if I'm using a few bucks in electricity every month it's only fair.