AvantB8

On the invoice price, I see some discrepencies between different sources (Edmunds, cars.com...)
In addition to that, my dealer is throwing some new stuff at me. I understand that there is the base invoice price + options + dealer Prep fee ($529 in my case, which I believe is too much) + tax, tag...
On top ogf that, my dealer also mentioned a Regional Advertisment Fee of $221.48?!@$%

Is this normal??? What is this fee since I have not seen it anywhere?

Also should I try to lower the Dealer Prep Fee from $529?

Thanks!