I deal, or used to deal, in a lot of budget stuff. But I was buying more-or-less
current budget CPUs. Waltchan is obsessed with price depreciation, and buying up old tech, albeit recently-manufactured, for reasons that I personally can only think of as a type of fraud. He recently recommended an i3-2100 Sandy Bridge CPU, supposedly selling for $15. I generally don't touch older tech much, although I more recently bought some OEM Dells, with Sandy and Ivy quad-cores, just to get CPU power on the cheap. After my experiences with those rigs, I dunno, maybe waltchan has a point. Though, I wouldn't really touch Sandy Bridge or Core2 rigs these days. The Dell OEM with a Sandy i5-2400, I made an exception for, as I had a plan for that rig, and it was barely over $100, with 8GB of RAM, a 1TB HDD, and OS included, complete. Hard to beat that.
Edit: Although, I would prefer to deal in only Haswell-and-newer tech, if I'm buying refurb / used, but Haswell stuff seems to have kept its value really, really well, for supposedly "old" tech. Plus, Windows 7 64-bit works great on Haswell, whereas it's not officially supported at all on Kaby Lake or Ryzen. (Which is really a shame, IMHO.)
Sandy Bridge ($115):
http://www.ebay.com/itm/Dell-390-Tower-Desktop-PC-Intel-Core-i5-2400-Processor/122466742656
Haswell ($250):
http://www.ebay.com/itm/Dell-Optipl...3-4GHz-8GB-DDR3-RAM-1TB-HD-GOOD-/201999940707
It's just crazy how high the prices are for Haswell gear. More than twice the price, for what? 20-30% performance improvement,
at most? Same DDR3, same SATA HDD tech. It's just crazy. Don't get me started on how much Skylake refurbs are going for. (Starting to sound like waltchan here.)