Depends how cheap is cheap. Jensonusa and ebay.com have some cheap Bombers 44’s with 15mm axle. They are the newer 2010 models with open bath damping. My friend has that fork but for 26″ wheels. It’s a good simple fork, a bit heavy but super smooth, worked flawlessly for the last 2 years. I’ve seen some cheap 29er Fox forks in a US online bike shop but can’t remember which one it was.
There is also this on sale:
http://www.sklep.gregorio.pl/product/index/productId/969
It’s within EU so no extra customs charge etc, and with stronger £ vs PLN it would work out at around £240 +postage to UK.
Also good thing about those 44’s the 2011 can be set at 100-120-140 by swapping spacers. The 2010 AFAIK can be set 100-120 or 120-140 depending on the version you bought.
Cheapest 44 TST2 29 qr15 I could find one in UK was 299 at Allterraincycles.