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I know the forum doesn't have much love for Tredz, but they've never given me any trouble
http://www.tredz.co.uk/.Shimano-HB-M758-XT-Front-Hub_92611.htmSingletrack say they can get them
https://www.singletrackbikes.co.uk/m7b231s424p14691/Shimano_Deore_XT_HB-M758_Front_Hub_with_6_Bolt_Disc_Mount_15_x_100mm/RS_GB/36437As do Triton
http://www.tritoncycles.co.uk/components-c9/hubs-c120/shimano-hb-m758-xt-front-hub-p9093/s22023I got my M758 in 36H from one of ze German shops, can't remember which one but none of them have them any more.
Just been through all the archived spec PDFs:
HB-M678 is listed as 32 or 36h in the 2012-2013 specs, but a lot of places seem only ever to have stocked the 32h version.
The specs for 2010-2011, 2009-2010 and 2008-2009 list both HB-M778 (Centrelock) and HB-M758 (6-bolt).
Before 2008, 15mm thru axles didn't exist yet according to Shimano.
So I'm probably looking for hubs delisted 6 years ago or 4 years ago, in a hole count that was unfashionable even then.