I just visited radioshack
http://www.radioshack.com/category.a...relay(keyword)
part number:
275-006 @3.99USD SPDT 2A
275-248 @3.99USD SPDT 10A
275-249 @4.99USD DPDT 5A
They will all do what you want - they are called SPDT or DPDT
S=single D=double T=throw P=pole.