You can buy stamps in several convenient places depending on your location:

• Post Offices: The most common place to buy stamps is at post offices, which sell all valid postage stamps. In Austria, for example, post offices are marked by bright yellow signs and operate typically from 8am to 6pm on weekdays, sometimes with Saturday hours at larger locations

• Online Postal Shops: Many postal services offer online shops where you can purchase stamps. For instance, the Austrian Post AG has an online shop selling valid postage and philatelic stamps

. The USPS also sells stamps through its online Postal Store

• Newsagents and Retail Outlets: In Austria, stamps can be bought at Trafik (newsagents) which sell basic stamps, and other retail outlets like supermarkets, petrol stations, and bookshops often carry stamps as well

• Philately Shops: For collectors or those wanting special or commemorative stamps, philately shops provide a wide selection and expert advice. Austrian Post operates several philately shops in cities like Vienna, Linz, Salzburg, Innsbruck, Graz, and Klagenfurt

• Specialized Online Marketplaces: For vintage or collectible stamps, websites like eBay and Etsy offer a variety of stamps, though caution is advised to avoid counterfeit stamps

In summary, you can buy stamps at post offices, online postal stores, newsagents, supermarkets, and specialized philately shops depending on your needs and location.