I would imagine that there are different MSRPs for different models (328 vs 335, auto vs manual, etc).
To see what the MSRP for each package is, go to the dealer and ask for a service history and list of options on your car. They'll run you a 4 or 5 page documentcalled a Warranty Vehicle Inquiry which will include all of the extended mx and warranty options.
I've got a 2008 328i fully loaded. Here are the MSRPs for each option:
The above pricing sheet was given to me three days ago.
The Gold extended warranty is an exact carbon copy of the CPO warranty - same coverage, same deductible, etc.
I give credit to the car dealers for coming up with the CPO concept - it's a helluva marketing gimmick to fleece the public.