I was looking for a prebuilt that had a decent cpu and decent upgradability for the future and came across a used dell inspiron 3650 with an i3-6100, 8gb ram, with no hard drive on ebay. His original asking price was $149.99 but I haggled him to $115 for it. It came and I took hard drive out of my old laptop and slapped it in and it fired up. Next was the hunt for a cheap but effective GPU, I looked on letgo and what would you know this mom (who bought it for her son, but her son upgraded) had a gigabyte gt 1030 oc edition for $60 in nearly new condition. I haggled her down to $40, slapped it in and it's doing good. So for $155 I built a decent all around pc, it's ran every game i've thrown at it. Cinebench r15 it did 378 and got a score of 1630 on unigen valley on medium settings with 2xaa.
Great gaming CPU. No complaints.
Great for the amount of money I got it for, but i wouldn't pay $89 for it.