For its newsletter subscribers only, newegg offers the refurbished TRENDNet Powerline Ethernet Adapter, model no. TPL-302E, for $19.99. Coupon code "EMCNHHF26" drops it to $14.99. With free shipping, that's $5 under our refurb mention from last May and $68 under the lowest total price we could find for a new unit. This plug-and-play Ethernet box uses your existing electrical outlet to create a secure high speed building-wide network. Coupon expires March 1.

A 1-year warranty applies, although it's unclear who supports it.