Free CDs and DVDs - CDWow gives free orders!

I just got an email from CDWow promoting a one day special:

For one day only...every 50th order on CD WOW! will be FREE! No matter what the size of your order, whether it’s for CDs, DVDs, books, games or any combination, we will credit back every 50th order so it costs you zilch!

It's not clear whether you will be told that your order is one of the ones that is being credited or not, though I'd assume that some form of notification would have to be active .... I already placed my order for Scrubs season 5 yesterday, though I was able to save 1 euro thanks to Realex!