Here are my thoughts on it: Most prices were grabbed from Ebay, your mile may vary.
This is a budget build with a 750G HDD, so it will be slow for the initial sync.
  • HP 260 G1 Mini - $62.40
  • Power adapter - $20
  • Memory - Included
  • SSD - Not required
  • Total - $82.40
This is a budget build that is a barebones setup, so you will have to install the CPU, RAM, and storage.
  • HP ProDesk 600 G2 - $25
  • Power Adapter - $20
  • CPU (Intel Core i3-6100T) - $10
  • Memory (4g) - $8
  • SSD (1tb) - $50
  • HDD (1tb) - $32
  • Total - $95-113
Probably want to go with a cheap SSD as you really don't save much with a HDD.