How will the rounding up and deportation go?
In our own history we have a model for that with Japanese interment camps. Go quietly or face the consequences. When it's not just the person who is threatened, but their entire family, compliance becomes the only option for most people.
As for $ costs, it's not a factor. Trumpites have already thrown in whole hog with tyranny. Even at their own financial detriment, they'll be happy to go without if that's what's needed.
Many German citizens didn't care that Jews were being deported/taken away. Many didn't know about the concentration camps, but even i they did they either didn't know what was going on there or didn't care-----or were supportive.
One of the features of a dictatorship is that things can happen fast. The consequences can be hidden and the people who supported tyranny can justify those consequences by blaming The Other.