I have a Compaq 486/33 with 16Mb that was given to
me. Here in the US
they're not worth anything. People are throwing them away.
Any, and I mean any working computer is worth something, the trouble comes
in when you add the cost of locating a person that wants it, and the cost
of getting it to them, that it may not be profitable. 20 is a fair price,
dollars or pounds.