Yes, They make one.
Yes, They do work.
Prices range from approx 600.00 and goes up from there.
There are a few different makes out there. I normally recommend using the search feature on this site and hybridz.org for information pertaining to this questions.
It depends what you would like to get out of your vehicle. I myself like the sds system.
Let me know what you want out of your car, to see if i can be of some help..