You can usually find dogs for sale in Sunday markets like the one near Empress Market, or through Facebook groups such as “Dogs for Sale in Karachi” or “Pets Pakistan.” Just make sure to verify the health and vaccination status before buying — a lot of people recommend checking the parents too, if possible.
Also, once you’ve brought your GSD home, you’ll need good quality food and accessories. You can check out Pawkistan — it’s an online pet store based in Karachi. They deliver all over the city, and the best part is that every order helps feed a stray animal 
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Let me know if you need help with crate training or first-time dog care too — happy to help!