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Data - Cat-6 Wall Sockets

Cat-6 wall socket 

Use Cat-6 wall sockets (not Cat-5 or Cat-5e).

The best place to buy it from is Monoprice.com.  Monoprice is an excellent company that sells excellent products at a great price with low shipping cost.  Wall sockets cost about $1.15 in 20+ quantities.

You can get different colors, but personally I think it's better to stick with white as they look better and it's hard to decide upfront what colors to use for what.