I have seen this before on cakesunlimited.net. I am sure you can contact the website and ask where they got it...Here is a picture from their site
http://images.google.com/imgres?imgurl=http://www.cakesunlimited.net/thumbnails/W569.JPG&imgrefurl=http://www.cakesunlimited.net/html/body_gallery_3_stacked_wedding_cakes_page_4.html&h =600&w=385&sz=19&hl=en&start=1&um=1&tbnid=5X259Euw zmfYXM:&tbnh=135&tbnw=87&prev=/images%3Fq%3Dthe%2Bnightmare%2Bbefore%2Bchristmas% 2Bcake%2Btopper%26svnum%3D10%26um%3D1%26hl%3Den%26 safe%3Doff%26sa%3DN
Here is another one that is on ebay. I personally like the other one better. http://cgi.ebay.com/NIGHTMARE-Before-CHRISTMAS-WEDDING-J-S-CAKE-TOPPERS_W0QQitemZ260090104262QQihZ016QQcategoryZ20 935QQrdZ1QQssPageNameZWD1VQQtrksidZp1638.m118.l124 7QQcmdZViewItem
Hope this helps! Good luck!