Where do you live? I think the fastest and most widely available service would be from Comcast, which is around 8 Mbps. If you live in a town where Verizon offers FiOS, which uses fiber-optics, you can hit 30 Mbps for $180 a month. The 15 Mbps version is cheaper at $45 a month.

http://www22.verizon.com/content/ConsumerFiOS/

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