In Hanoi, you can buy a toaster at several places, including:
1. **Electronics and Home Appliance Stores**: Large chains like Nguyễn Kim, Pico, or MediaMart often have a wide selection of toasters from various brands.
2. **Supermarkets and Hypermarkets**: Big C, Lotte Mart, and AEON Mall usually have home appliance sections where you can find toasters.
3. **Online Retailers**: Websites like Tiki, Lazada, and Shopee offer a variety of toasters with the convenience of online shopping and delivery.
4. **Local Markets and Small Shops**: Some local markets and small shops in residential areas might also carry toasters, though the selection may be more limited.
These options should give you a good range of choices to find the right toaster for your needs.