In reply to BikingLampy:
Some options are:
Snowcard. Worked out about the same cost as BMC last time I looked.
Dogtag. Not sure how it compares at the moment.
Join the BMC and get theirs. They seem to have issues from time to time with actually selling insurance. I've had to claim from BMC for rescue and repatriation before. Would have some criticisms of the company they used to do the repatriation, they got the job done fairly painlessly but hadn't actually properly organised for a hospital to receive me in the UK, so had to be admitted via A&E. Apparently it's not uncommon. I didn't kick up a fuss at the time (was more concerned about whether I'd get full use of a pretty mangled knee back) so I guess I can't really complain too much. I still mostly use BMC.
Austrian Alpine Club is a popular option but only covers rescue I think. You'd need some other cover for medical and repatriation.
Whatever you go for make sure you check T&Cs properly.