"Where are you now at?" — grammatically correct?

Both are possible in speech, although the first is probably more likely. They can be:

a) an inquiry about someone's location;

b) an inquiry about someone's mental, spiritual or emotional state; or

c) an inquiry about which page someone has reached in a book.

Neither example feels very comfortable grammatically although I feel this is perhaps a BE view. We used to say 'a preposition should never be used to end a sentence with.' In fact, the use of at in either case seems redundant since both examples make sense without it.