The marketplace closes at 7.

There is a grocery at Conrad and Bowman, two blocks from the train, and at Ridge and Midvale, also two blocks from the train. Neither is a supermarket, but the OP used the word GROCERY.

It used to cost me $10 for a cab ride from downtown to the Falls, but I walked a little at either end to keep the cost down, getting off at Ridge and Midvale, for instance, and the price might have gone up recently.