Buy.com offers the TRENDnet 500Mbps Powerline AV Ethernet Adapter, model no. TPL-401E, for $37.99 with free shipping. That’s the lowest total price we could find by $20 and beats our mention of a 2-pack from last week, which was $42.50 per item. This plug-and-play adapter uses your existing electrical outlets to create a secure 500Mbps high-speed building-wide network.

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