Gary Fisher Sugar rear triangle.

I have been given this bike which is a 4+. The rear triangle is cracked by the pivot which, since I started looking for one, appears to be quite common. The dilemma I have is I don't seem to be able to find a new one but I have been told of a local chap who can weld aluminium.
Ideally I would prefer a new rear triangle so - Can anyone give me an idea where I can get one? Evans failed at the first attempt.
If I go down the repair route - Does anyone have experience of such a repair and would it last or just move the weakness somewhere else?

Find a Trek dealer, they'll be able to check on Dexter to see if the part is: a) on the system and b) in stock.

If it's not on the system then it's most probably because they don't supply it anymore.

|f it's on the system and showing zero stock and is not used on a current bike (it won't be) then don't expect it to ever be in stock again.

Evans purport to be Trek dealers and their computer says no. I'll ring around a few more to be sure. I've tracked down a second-hand one for £65 inc p+p from somewhere in the U.S. so if all else fails that'll have to do.