I have a Linksys router (BEF5841-for use with cable modem) which is connected via Ethernet cable to 3 PCs. I have just acquired a Dell laptop which is Wi-Fi enabled. I can easily connect this to the Internet via a cable to a spare port in the router. It would obviously be more convenient if I can plug a device into the router which will transmit wirelessly to the laptop. Is there such a device? Approximate cost?