Looking for a small hardtail frame for 26" wheels

I'm finding it difficult to find a decent hardtail frame for my son. Not a complete bike as we're transferring components over.
It needs to be relatively small - 14" or 14.5" and ideally aluminium as steel will be too heavy.
He is a pretty good rider and does a mix of different stuff including relatively technical trails and longer days out with me.
He'd like a Santa Cruz Chameleon, but they're thin on the ground and pretty expensive.
Any suggestions of what to consider and where I can get it?
It needs to be relatively small - 14" or 14.5" and ideally aluminium as steel will be too heavy.
He is a pretty good rider and does a mix of different stuff including relatively technical trails and longer days out with me.
He'd like a Santa Cruz Chameleon, but they're thin on the ground and pretty expensive.
Any suggestions of what to consider and where I can get it?
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Votec V.SX Enduro 'Alpine Thug' 2012/2013 build
Trek Session 8
just found this, any good?
http://www.ebay.co.uk/itm/Banshee-Mythi ... 27e8d0434c
You can get some pretty cheap small framed On-One bikes there.
http://www.planetx.co.uk/i/q/FROOVDO126 ... al-dropout
This would be perfect but not due in until December. They do tend to float around ebay though.
Yup, alu, not steel please. Otherwise I'd be looking at an XS (14") Cotic Bfe or Soul.