Oil prices nearing the $100 mark sent major markets down over 1 percent, as the Dow fell 1.38 percent to close at 12058.02.  Cavco lost 5.68 percent, Skyline was down 3.88 percent and Nobility Homes lost 2.44 percent.  Deer Valley, so volatile recently, was unchanged.  The Manufactured Housing Composite lost 4.64 percent to close at 1093.30.