www.allelectronics.com
1 ohm, 75 Watts (Way over rated, only 5 Watts is needed, but you have to go a smidge higher, for safety and accuracy).
$3.50 a piece.
Of course they have to be out of stock on it, + discontinued!)
So 2 * 2 Ohm, 10 Watts each, 0.33$ a piece. Hook them up in parallel for 1 Ohm.