I have a Lenovo ThinkCentre M75 A7U 5042 desktop here, free to anyone (you need to pay shipping though).

Here's what you get:

 

• Case
• Motherboard with processor/built-in AMD GPU
• Optical DVD drive

Here is what you don't get:

 

• A working PSU
• RAM
• HDD

Basically the PSU was failing so I used memory, HDD in other desktop. The desktop works but sometimes it just freezes.

The catch: it's a US-model so no local parts directly from Lenovo - you might replace the PSU with something else, or use the other components.