What AC Adapter for Powerbook 520?

Can anyone give me an idea as to how much I would pay for one of these, and where I could get one?

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Blah Blah wrote on 18 January 2004:

Hi, I have been looking for a VERY Powerbook now for some time, to be mainly used by my 8 year old son who has learning difficulties. I have found a Powerbook 520 which looks to be in good nick but has no AC Adapter. Can anyone give me an idea as to how much I would pay for one of these, and where I could get one? Thx Andrew.