It's a commonly asked question, "Why is Fist Of Fun not available to buy?"
The answer is, simply, because the BBC has yet to release it.

I think it's fair to say that almost everyone who visits this site would like to see an official release (even now, 10 years after the event) so get your details down on here, and we'll see if we can't change the BBC's mind...
It might also be worth contacting the BBC directly, and letting them know that you'd like a release.
You can do that by writing to them at PO Box 1922, Glasgow, G2 3WT or by calling them on 08700 100 222.
They can even be contacted via textphone too, on 08700 100 212.
There is also an online form at the BBC website, which you can access here. Please keep any comments to them polite and courteous, but make the point that you would like to see a release of Fist Of Fun / TMWRNJ asap. If you can't be bothered filling in web forms, you can use this text as a template, or just copy it over.
It might also be worth writing to BBC's Worldwide department directly, they can be reached at BBC Worldwide Products and Sales, PO Box 326, Sittingbourne, Kent, ME9 8FA - or call 0870 600 7080.
They can also be emailed directly at bbcproducts@galleon.co.uk.