To "buy Wi-Fi" for your home, you actually need to purchase two distinct things: an plan to bring data into your house, and a Wi-Fi router to broadcast that data wirelessly to your devices. 1. Choosing an Internet Service Provider (ISP)
The available options depend entirely on your specific address. Most regions have a few primary types of connections: How To Choose The Best Internet Services Provider - Astound where can i buy wifi for my home