Want to be the first one on your block with a 3-D television? It will cost you about $3,000.

Samsung and Panasonic will start selling 3-D TVs in U.S. stores this week, inaugurating what manufacturers hope is the era of 3-D viewing in the living room. But because the sets require bulky glasses, and there is for now little to watch in the enhanced format, it will take at least a few years for the technology to become mainstream, if that happens at all.

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