$50 sounds about right and the more that is included in that price, the better.
Mine came with a fantastic Targus bag built for the 5300, and the internal power supply module for the expansion bay that allows you to bypass the notoriously fragile AC power connector in the back. Throw in a working floppy module, the manuals, the boot disk, and a monitor adapter, and I had a pretty good score for about $50.
It is in fine physical shape, fires right up, and what's more, it was stamped as having gone through the long ago repair extension program to fix the power connector and the hinge plastics.