Yep. Here's the one we use....
http://www.amazon.com/TP-LINK-TL-PA...XMXW6HGZ&dpSrc=sims&dpST=_AC_UL160_SR160,160_
THIS way, you connect your TV *directly* to the cable modem, and you get the full speed without the logjams of wi-fi. They work great.
These are good, but not without their issues. The big caveats to powerline adapters is that they come rated with the total physical layer bandwidth available for the system (so devide by the number of devices, then by two for bi-directional communications, then account for overhead etc.), which people confuse with the actual throughput you will receive when connected.
I actually had the exact adapters linked by Sam (coincidentally, connected to my Roku 3), and while they are "rated" for 500Mbit (per the AV2 standard), first and foremost they only have a FastEthernet adapter in them, so they can only connect up to 100mbit max, which is fine since Metrocast's fastest service is 75mbit I believe.
Second, you are incredibly unlikely to get connected at the higher rates, and actually stressing the connection will force it to negotiate to a lower rate. With both adapters connected to the same circuit in my home (so maybe 30 ft of romex cable with zero breaks between them) the highest negotiated rate I saw was 88mbit, but when running UDP throughput tests (iPerf), which is indicative of the type of data you would receive when streaming video, the negotiated rate dropped to the 50 something, and the effective rate to the upper 20s.
Again, this really isn't an issue as even the highest data-rate 4k video from Amazon Prime or Netflix is well below 20mbit (I believe Netflix's 1080P resolution floats from 6 to 8mbit).
And the third issue with powerline is that anything high powered on the same circuit (microwave, fridge/freezer, AC, etc.) will kill your connection when it kicks on.
Even with all of that, it should still be a much much better solution for streaming media than wireless.
For a cheaper and faster solution, if you have unused coax in your wall (which you might if you are a cord cutter) try a MOCA or DECA adapter. I bought this pair for $14 and have had a perfect 100mbit connection back to my network closet for my media devices in the living room. They are a bit bulkier, and I have found the power bricks draw about 2 watts when idle and 5 watts when in use.
http://www.amazon.com/DIRECTV-Broad...8&qid=1444747237&sr=1-2&keywords=directv+deca