Best Buy offers the Actiontec Powerline Network Adapter Kit, model no. PWR511K01, for $49.99 with free shipping. (TigerDirect charges the same.) That's tied with our June mention and the lowest total price we could find by $5. Sales tax is added where applicable. It features Ethernet connectivity and data transfer speeds of up to 500Mbps.

Update: J&R offers the TRENDnet 4-Port 500Mbps Powerline AV Adapter, model no. TPL-405E, for $46.99 with free shipping. (Click through to see this price.) That's the lowest total price we could find by $3. It features four Gigabit Ethernet ports. (You can also buy two for $88.98 via coupon code "USMEDALS" with free shipping, or $44.49/adapter.) Deal ends August 12.