WiFi range extenders and mesh
WiFi range extenders (repeaters) rebroadcast the existing signal but are limited by router distance, allow only one or two chained units, and often suffer from latency or dropouts. Prices are from $35.
Mesh systems are essentially WiFi extenders with added features such as automatic roaming, unified SSID, and better load balancing. Prices from a $200
WiFi over power adapters
Over-power adapters extend ethernet from the router to other rooms using power lines; no cables are required. Prices are from $60 for a pair.
Home WiFi routers and mesh
Basic routers and modems in one are suitable for home or office internet. They provide a WiFi reception area within a house, typically within 15 metres radius on open space with up to 20 WiFi simultaneously connected devices. Prices are from $30.
WiFi access points and mesh
WiFi and mesh networks with multiple access points are suitable for large homes, offices, and public WiFi installations where 100+ devices may be connected simultaneously. Wireless mesh provides uniform coverage with automatic roaming between nodes. However, a purely wireless mesh is often ineffective in large homes with concrete walls, where Ethernet backhaul is usually required. Prices are from $150 per device.
Network switches
Network switches extend the number of Ethernet ports available from the router. PoE switches provide power to WiFi access points. Prices are from $30