If you don't know what a Goodbyn is, here's a pic:
As you can see, they have lots of neat little compartments for filling up and a thermos too. I haven't been sure whether I wanted one for the longest time but with this deal you can get one for just under $3. Definitely worth that!
All you have to do is sign up for an account here: http://www.gilt.com/account/register?pkey=mtvmen2
For signing you will receive a $20 credit to your account. Check your account after 2-3 minutes for it to show up. Once it's there, click on the 'Children' tab and you will see the Goodbyn selection which are priced at $15. I'm pretty sure they are normally more than that so $15 is good as it is. Anyway, add one to your shopping cart (I got pink for Willow and Stephen is going to order one for Ryder!) and go to check out.
The shipping costs just under $8 and with your credit, all you will be paying is $3!!! Now run, get yours!