Prepaid Mobile Internet for skiers in Austria. 3SuperSIM
Price: 19.90 Euro see details
That is 9.90 SIM card, and 10 EUR for 1000 SMS, 1000 minutes and 2 GB of data traffic.
Speedtest (fastest result, Ahorn):
Another options (about same price):
9 EUR for 10 GB data traffic only (4Mbit/s DL; 2Mbit/s UL) see details
Where to buy prepaid SIM in Mayrhofen: