Call Mike at Neito Research, tell him you would like to participate in a diaper study, Its really easy, he sends you a package of diapers, you use them, and fill out an evaluation on what you think of the diapers, what you would want to be changed etc etc. That's it!
Super easy, and it save's ya a week or two of buying diapers

Call 1-888-548-0811 number and leave your name, phone number and your child's current weight/diaper size.

If you get voice mail, leave a message, and he will call you back!

PS
Mike says for those of you who have participated, he would love to hear from you again, he enjoys having people who actually follow through and do the surveys, not just use the free diapers!