PS Audio's Power Port duplex wall outlets sell for $49.95 ea. These are the best that I have seen in the marketplace. They are polished, nickle-plated over copper contacts with triple blade wipers for the best electrical connection possible with very little corrosion over time. The are worth every penney! Go directly to the PS Audio website or they are available mailorder from Music Direct and AudioAdvisor.
Cheers.
Cheers.