Reddit mentions of ACTIONTEC 500 Mbps Powerline Ethernet Adapter and 4-Port Hub Kit (PWR514K01)

http://amzn.com/B00CB2F65O

Thank me later.

Think you'd need the kit for the exit node (so router to node then goes node to node then node to 3 whiteboxes): https://www.amazon.com/ACTIONTEC-Powerline-Ethernet-Adapter-PWR514K01/dp/B00CB2F65O/ref=pd_bxgy_147_img_2?_encoding=UTF8&pd_rd_i=B00CB2F65O&pd_rd_r=2CZVY11N2B63C3RSR913&pd_rd_w=5LyyK&pd_rd_wg=JHAo6&psc=1&refRID=2CZVY11N2B63C3RSR913

Seems like a decent price to try it out with. The TP-Link powerlines seem better quality overall but more expensive (you'd get wifi in your basement too though): https://www.amazon.com/TP-Link-AC1750-Extender-Powerline-TL-WPA8730/dp/B01CVOM140/ref=sr_1_1?s=pc&ie=UTF8&qid=1482156979&sr=1-1&keywords=TL-WPA8730%2BKIT&th=1

You get points for MacGyver-ing together working solutions, but are you here are some better and "more proper" ways of doing it:

1. Best case, if you can run in a single Ethernet cable from your bedroom out the living room, then get another wireless router and place that into the living room. Connect the two routers together lan (not wan) port to lan port. On the second router in the living room, going to the menus and turn off DHCP so that IP addresses will only be issued by the router in the bedroom. Boom you're done and everything will run fast and smooth.
   
   
2. if you can't run the ethernet cable, you can also replace the ethernet cable with power line networking boxes to use your electrical wiring to create virtual ethernet cable to connect the two routers as described in number one. This will cost a bit more then the cable and its performance depends on the type of wiring and stuff in your house, but you can work really well.
   
   
3. you can also get power line networking devices that have wireless or additional wired ethernet ports on the receiver box. For example, this one has a receiver box with four ethernet outputs that could accommodate your equipment in the living room without an additional router needed.
   
   
4. if you still want to go the wireless route, you can get a wireless bridge unit that will connect to the wireless signal coming from your main router and then distribute that to the additional wired devices in your living room.