There’s a book called The Black Eagle Inn by Christoph Fischer that kinda delves into this. I read it because I was interested in the same thing in terms of the “average” person living in Nazi Germany, but man it was a slog to get through and it’s only 300 pages. I don’t know if it’s just poorly translated or what, but the writing is awful. I’m sure there are better books out there, but you might want to give the book a try.