Go to diapers.com
Fill your cart with $50 worth of diapers.
Use coupon code CCIN6116 at check out to get $10 off your order of $50. You will automatically get free shipping because the order is over $49. This coupon code only works for NEW customers, so if you already have an account with them, it wont give you the discount.
When you are checking out, look for a banner that looks like this:
Click on it and print out the refund offer. Fill it out and send it in with a copy of your diapers.com receipt. I believe this refund is also only available to new customers.
With the coupon code and the refund, you get $50 of diapers for $25. For the sizes that I ordered, I got 284 diapers, which comes out to a little over $.08 per diaper. Not bad! I already ordered mine and they came in just a couple of days, so the free shipping is really fast. I submitted for my refund, also. It takes a few weeks to get that back, so I don't have it yet, but that will be a nice surprise in the mail when I do get it! Hope this deal helps some of you out!
UPDATE: I have received an email from parenting magazine and my rebate is on its way!