Garage Sale - price question

[Executioner]

I'm having a garage sale next month, and I have 3 computer desktops that I'd like to sell. The only problem is I'm not sure what to ask for them. They all have a fresh install of each OS, and a fresh install of Libre Office. These were systems that were given to me last year, and they sat in my garage.

1.
Custom Build
200g HD
AMD Athlon 64 3700+
Linux Mint 18.3 x64
3g Ram
Radeon X1300
Wireless card
MSI mobo K8N NEO 2
Libre Office

2.
Dell Dimension E520
Windows XP Media Center 2005 SP3
300g HD
2g Ram
Intel Core 2 6300 @1.86GHz
Wireless card
Intel G965 Express Graphics
Monitor with built in speakers (sound bar underneath the flat screen monitor)
Keyboard + mouse
Libre Office

3.
Custom Build
Windows 7 Home Premium x64
Intel 2 Duo E8400 3GHz
8g Ram
Intel mobo
NVIDA GeForce 8600 GT
USB 2 & 3
500g HD
2 DVD/CD-R drives
Libre Office

[Genom]

About a hundred bucks on the first 2, 150 on the third? Maybe 200 on the third.

[Executioner]

Thanks for the suggested prices.