get a price from cornerstone. then go to your local dealer. some will match the price, others will try to tell you the coverage is no good, others will let you walk.
I bought the ESP a few months after I bought my Street Glide Special. There are 4 different dealers within 45 minutes and I called them all comparing prices for the exact same coverage. The prices were $900 apart. It pays to shop around!
I've heard the price can vary. I got a price last Saturday for the 5 yr. coverage less tire/wheel. It was $2,500. I have 74,300 and plan on hitting 100K so I'm sure I'll be using it more as the miles climb