When driving on Austrian Motorways you are obliged to buy a sticker which is valid for one year and costs € 96,40 (you can buy it from December of the year before). The new years's Vignette must be applied by 31st of January 2024 and is valid until 31st of January 2025.
The Vignette is available in post offices, Tabak Trafiken and gas stations. You can also get a 2-month-sticker which costs € 28,90 and a 10-days-sticker which costs € 11,50 (suggestive if you buy a car at the end of the year). Motorbikes € 38,50 a year.
(In the picture: Vignette for 2024.)