This is the best place I know of: https://www.floodfordesp.com/
I just purchased my Gt convertible last week. Decided that this car will be a keeper so I wanted the ESP 8 year premium plan. The dealer tried to make $1,000 profit on the ESP. Foolish move since I am a retired dealership finance director. Anyway the dealership re-did the finance contract and ESP plan to match the online pricing found at Flood.I pay for 8 year 75,000 miles with 100 deductible and one day rental 1245 from Andersonkoch Ford.
The floodford site link above covers the same as me for 1210.