I've got this 26 year old PC here, and I no longer use it. It's got a 40GB HDD, 384MB of RAM, and 2 USB ports... I know, it's a dinosaur. But, it's perfect for a sleeper build, or if you have nostalgia for old electronics.
You get everything you need to get her up and running, including a monitor, mouse, keyboard, and all the cords.
It's super clean and runs how it should (with the exception of the monitor, as it's a bit shaky for some reason), but don't try connecting it to the internet, otherwise, you may get hacked.
I suggest trying to install a super light Linux OS such as Puppy Linux. You could also install Microsoft POS Ready 2009 off their website.
$30 OBO, cash only. Might trade for a Garmin GPS.