The cost of a WiFi range extender can vary depending on its type, brand, and features. Typically, single-band range extenders can cost as little as $20, while dual-band range extenders can range from $30 to $100 or more. Wall-plug range extenders are usually the most affordable option, costing between $20 to $50. Desktop range extenders are more expensive and can cost between $50 to $150 or more, depending on their specifications. Mesh range extenders are typically the most expensive option, with prices ranging from $100 to $500 or more, depending on the number of units included and the range they offer.