Hi Jane, And welcome to the forum. ?
The post at the top of the main page will be worth a browse
(link here)
I would think that, given where you are, there will be a number of Mercedes dealerships within a 50 mile radius and as a piece of advice, if you hear of any dealerships offering a discount then ask a local dealer if they will match it. Sometimes, depending on that dealerships sales, they will be able to offer the same or even better.
Happy hunting. ?
? I will be remembered for nothing but had great fun doing it ?