When driving on Austrian Motorways you are obliged to buy a sticker which is valid for one year and costs EUR 96,40 (you can buy it from December of the year before). The new years's Vignette must be applied by 31st of January 2023 and is valid until 31st of January 2024.
The Vignette is available in post offices, Tabak Trafiken and gas stations. You can also get a 2-month-sticker which costs EUR 29,00 and a 10-days-sticker which costs EUR 9,90 (suggestive if you buy a car at the end of the year). Motorbikes € 38,20 a year.
(In the picture: Vignette for 2023.)