Financing conditions fluctuating sharply

Dear community, I am currently asking many dealers about leasing / financing conditions etc. I noticed that the dealer conditions are very fluctuating – partly in the range of almost 400 or 500 euros. Everyone actually works with the VW Bank, wouldn’t the conditions have to be the same everywhere? I wonder just how it can be that some dealers release their cars for around 500 euros for financing and others for around 1000 Eur o. To this one must say that it is always about the same model, the mileage as well as the engines and also the prices all in the same range. I am of course aware that one thing can theoretically be cheaper with Edeka than with Rewe but in such large ranges? Maybe someone can answer me the question so that I can understand it reasonably.