*Lynx adjusts his glasses in proper nerd fashion.
It would help to know the specs of course - processor type and speed, RAM, motherboard cache size - but for a 2013 that is still working fine that sounds like a reasonable price. Not a "WOW what a deal!" price, but a bit lower than average for a mac from 2013. If you need one, get it.
Of course if you don't need it... nothing is a value, even if you only paid a penny for it, unless you need or can resell it.