Same here, although I'm not looking to buy one right at this moment, but eventually. I believe wheresmycoin indicated he had a couple graded Silver 100K Dogecoins in his sale thread here:
https://bitcointalk.org/index.php?topic=1108537.0 Not sure if he still has them left but that would be a great place to start if you're wanting to buy one. TookDk just sold a very nice graded 100K Dogecoin recently as well, you might be able to make an offer to that buyer.
Good luck with your search gravitate!