Fry's Electronics offers the TRENDnet 500Mbps Powerline AV Ethernet Adapter, model no. TPL-401E, for $24.99 with free shipping. That's the lowest total price we could find by $30 and beats our mention of a 2-pack from a month ago, which was $26.50 per item. This plug-and-play adapter uses your existing electrical outlets to create a secure 500Mbps high-speed building-wide network.

Update: It's available for in-store pickup only.