cant seem to see these for sale anywhere new – are they s/h only?

Might be OEM. I was looking for same until I’ve decided to upgrade my frame instead.

Check eBay I suppose.

What wheel size?

I’m led to believe the G2 offset if 51mm; if it helps at all that’s the offset Ibis spec for the Ripley and there’s a thread on MTBR about compatible forks here.

Pretty much impossible to get hold of unless one comes up on eBay.

Gave up trying to find one for my Gary Fisher Marlin and ended up getting a Manitou Tower Pro, which has a 48mm offset – been running it for two years now and it’s simply great.

All change folks. The G2 offset has been released by Trek to Fox, Rockshox and anyone who wants to use it. As told at TrekWorld today.
Apparently the big 2 had told Trek 50.5mm and 51.5mm had been requested by many frame brands, so Trek agreed to avoid another ‘standards’ issue.
So the answer to the question is simply Mojo or Fishers. Or the LBS

Depends what fork you’re after as the 29’er 34s already have a 51mm offset.