You may try looking at backpacking forums or mountaineering forums. Maybe shoot an email to rmiguides.com who guide mountain climbs.

I have a high altitude lighter, I can't recall the name. Its a pressurized butane lighter with a clasp lock and some other 'novel' concepts like a button compass and waterproof seal. It's basically a suped up bic.

I have used it over 12,000 feet but it was also next to my body so it wasn't frozen.