Easiest way to find the salesperson who'll care is this: Look for the angry one. He's the one who has been hassled by the management to do cold calls while the one or two "top" salespeople get to do all the business. He's the guy that probably also knows the most in the store, but you'll never get to talk to him because as soon as you approach, he will be whisked away and replaced by one of the "top" people.
Mom and Pop is the way of the future.
Mom and Pop is the way of the future.