yeah, you price expectation is too low. To get x16 x16 performance, you are looking at a 150 board. x16 x8 performance can be gotten in a 120 board.
The least expensive dual x16 board that I can recommend is this for 149:
GIGABYTE GA-990FXA-UD3 AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboardhttp://www.newegg.com/Product/Product.aspx?Item=N82E16813128514