Sorry for returning to this old post but I too am bolt-less.
I bought new SLX 10sp shifters recently to run with my XT M785 brakes,as shown below-
http://www.chainreactioncycles.com/shimano-slx-m670-10-speed-trigger-shifter/rp-prod83171
However they came with no bolts at all! Were they supposed to?? I have emailed CRC asking them to send me some as I am loathed to pay £9 for a set of flippin bolts! If they say no I will send the stupid things back and get some bar mounted ones. This whole thing has been a massive pain as I ended up having to buy a new SRAM 9sp mech to replace old ruined one as the box of shiny new Shimano 10sp stuff I got from CRC was completely useless due to there being no stupid bolts!!
Has anyone had any success in finding reasonable priced mounting hardware? I am after exactly what the OP was after all those months ago! Can anyone help?