Adding Wi-fi to Ethernet

Many devices today, EG. Blu-ray box and TV sets etc. have an Ethernet socket for a cable to BB router but in some cases a cable connection is not possible or convenient and the use of the routers Wi-Fi would be convenient to use. Snag is from my looking around these adaptors to put into the Ethernet socket of the unit do not come cheap, maybe there is a lack of demand.
Any cheap units or cheap ways of doing this?

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