I heard about this through momsincincy.com, from user emmasmom. Thanks for the tip! She said:
"Go to uddercovers.com, click on "Shop Now", select the product you would like (they also have 3 piece gift sets available with this promotion) and you will automatically be directed to the center of the page where you can enter in the promo code! Type in "Family2010" and it will pull up the ones available. They are selling out fast. You can use the code more than once - you just have to open a new browser/window to do so. Good Luck!"
Penny would never let me use a nursing cover, but maybe you will have better luck than me.