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Electrical - Wire NMB 12-2 (Internal)

Wire NMB 12-2 (Internal)

Available at Home Depot or Lowes.

http://www.homedepot.com/h_d1/N-5yc1v/R-202304610/h_d2/ProductDisplay?storeId=10051&keyword=Cerrowire+250+ft.+12%2F2+NM-B+Wire&jspStoreDir=hdus&Nu=P_PARENT_ID&navFlow=3&catalogId=10053&langId=-1&ddkey=Search

The price varies a lot with the world commodity price of copper, but about $78 for a 250 foot roll.

It is rated for 20 amps.  It is the most common wire used in houses.