You can Buy a Cheaper DW Double Kick Pedal for about $100...
The one I got which is the DW Pacific 400 I picked up for $70 new on e-bay about a Year ago...
It is like this one:
http://www.music123.com/DW-Pacific-DP402-Double-Bass-Drum-Pedal-i21192.music?source=froogle
It is the First Double Kick pedal I have owned for the Last 10 years or so and it Plays better than the double Kick pedals I used to own back then that were 5 times the Price, With Proper adjustment it can be a Very fast and Accurate Pedal.....
Just a Thought!!!