Zyxel AV2000 Powerline Kit, Pass-Thru, 2-port Gigabit, Brown Box (PLA5456BBKIT) $39.99 with free Prime shipping @Amazon

Sold by Zyxel and Fulfilled by Amazon in easy-to-open packaging.
This is the lowest it has been on Amazon according to CCC and more than $35 less than the average historic price.
https://www.amazon.com/dp/B01MTNKNPZ