A DigitalPoint Forums thread shares that one new advertiser just got his. Here is a picture he took.
Now, if you want one, we did report that Google Mini Fridges Up For Sale at eBay in the past, maybe you can get it that way. I did email my AdWords representative, he said he would look into it, but I have not heard of a way to buy these coolers directly from Google.
Forum discussion at DigitalPoint Forums.