TRENDnet Launches Compact 200Mbps Powerline Adapter
This compact network adapter extends your current network in a home or office through the electrical lines.
Looking for a way to extend your home or office network without the hassles of Ethernet cords and spotty Wi-Fi signals? Why not use the power outlet mounted in your wall instead?
On Wednesday TRENDnet released the latest edition to its Powerline AV series, the 200 Mbps Compact Powerline AV Adapter (TPL-306E) and Adapter Kit (TPL-306E2K). This adapter essentially establishes a network connection from a router to a PC via a building or home's electrical lines, but consumes less physical space on the wall outlet than previous models.
"The TPL-306E replaces and is approximately 30-percent smaller than the older TPL-303E series," the company reports. "Its small form factor saves space when plugged into a crowded electrical outlet. Network one adapter to a router and plug another adapter into any outlet on the same electrical system for instant high speed network access."
The TRENDnet adapters connect automatically to each other over a secure encrypted signal with no CD installation required. They also feature an LED display which relays device status for power management and troubleshooting. And because they're always on, TRENDnet has implemented its embedded power-saving technology which lowers power consumption by up to 70-percent in standby mode.
End users looking to set up a powerline-based extension to their network will need at least two TPL-306E adapters, costing $54.99 USD for each. However for $99.99 USD, the 200 Mbps Compact Powerline AV Adapter Kit provides two adapters to get you started.

Passing ethernet cables was the best option.
Yeah, unless you go with the big money ones, these don't tend to be gigabit (they're 10/100 not 10/100/1000).
I wish I had an organized way to this too.
Sound's like I had a similar situation to you and this solved it perfectly for me, once I plugged them in and configured them it worked. I would also like to add as a testament to the quality these products have now, is that I was in a building unit that most likely had 16 individual apartments in some form or another sharing noise on my line, and again worked flawlessly.
The only thing I don't like is that without looking this product up, without a doubt its really a 10/100 device with deceptive duplex speed advertising.