I have a few desktop PCs that I was going to use for future projects, but have changed plans and decided to sell. See below for specs/prices. All prices do not include shipping.
Lenovo ThinkCentre M90P - $110 100
-   i5 CPU ( model  660 – 3.33 GHz )
-   8GB DDR3 RAM
-   250GB HDD
-   DVD Drive
-   VGA and DisplayPort out
-   Windows 10 64-bit pre-installed and activated  (upgraded from Win 7 Pro)
-   Shipped with new USB keyboard, mouse, and power cable
-   Small Form Factor
Lenovo ThinkCentre M90P - $100 90
-   i5 CPU ( model  660 – 3.33 GHz )
-   4GB DDR3 RAM
-   250GB HDD
-   DVD Drive
-   VGA and DisplayPort out
-   Windows 10 64-bit pre-installed and activated  (upgraded from Win 7 Pro)
-   Shipped with new USB keyboard, mouse, and power cable
-   Small Form Factor
HP Compaq DC7900 - $65 55
-   Intel Core 2 Duo E8400 processor 3.0 GHz
-   4GB DDR2 RAM
-   2x160GB HDD
-   VGA, DisplayPort, and dual DVI out
-   Windows Vista Business pre-installed and activated
-   Shipped with new USB keyboard, mouse, and power cable
-   Small Form Factor