We are currently working on a new design that is smaller, lighter, less complicated, uses less power and most importantly, less expensive. It will also not require the C4 block-off connector, so there will be no core charge.
Here are some spy shots of our first prototype...

(Key to my car not included!)
However, we have not completed testing on this design yet, so we do not know if it will work.
Unfortunately, the development and testing of this design has pushed back our earliest delivery date to about Feb 1st. We weighed the options and we thought people would be willing to wait if it gave them a better product for less money.
If you need something sooner, let me know and we can send you a loaner unit.
I apologize for the delay and hope to get these done soon...