Amazon has WiFi Extender Signal Booster for Home: Internet Repeater Range Covers Up to 9995 Sq.ft and 45+ Devices for House Wireless Office Basement Room (White, 3XL) on sale for $26.99. Shipping is usually free to Amazon Prime members or on orders over $35.

Since prices on Amazon change frequently, please review the current price at the product page before making a purchase.