I wouldn't say that they hand them out "left and right" and you should also keep in mind that this varies by school. That being said, schools do sometimes give out fee waivers on the spot. More common is to get one in the mail soon afterwards, though you'd have to put your name and info down for them to contact you. If you feel your stats merit a waiver, you can ask directly what they are looking for, though I would be more subtle about this. In other cases, you can say something along the lines of "I'm really interested in your school, but don't know if I have the money to apply", but PLEASE don't say this if it isn't true. Just have a good convo and work it in; if they want you and think you were genuine, they'll give you a waiver.