Well i was able to buy a pair for £50 posted on the bay though I doubt anyone ever uses the rear shifter (my rear is basically a spare . I'm in Ipswich so only run 1x9 myself.)The rh seems to go for £40 to £50 ,- slightly less than XTR one - though much easier to get a pair in 970 and prices seem to be rising for M970s.
The m810 aint as pretty as the xtr - does the job just as well but differently. Certainly a step up from the deores and lxs i've used.
Rear my original reply - it should read M970s easy to get off singletrack - M810 not so easy.
Have you considered these - http://www.merlincycles.com/bike-shop/m ... evers.html
you can take the pods of these (i believe come with blanking plates) and thats a fantastic price. (just noticed out of stock) I found this article http://superlightracer.blogspot.co.uk/2 ... -m770.html
I'm in Ipswich so only run 1x9 myself.