Sure, but how many of them will actually get it? Plus it takes 2-3 weeks to get it. That timeframe will probably increase if they get more applicants. Spend 85 dollars, wait for a few hours for an appointment, or get to the airport a few hours early. I'm betting most for getting to the airport early.
I made an appointment one week out. I was there for 10 minutes. I was approved 1 week later. It was simple