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It took me about 45 minutes before I got an email confirming my purchase so hopefully yours is just delayed.
1 year, 10 months ago on (Update Nexus 4 16GB Sold Out) Nexus 4, Nexus 7 3G, Nexus 10 Now Available Through Google Play
I managed to get mine in and got all the way through the process complete with order number. Some how there are two pending charges but I'm sure they will work it out. At least the servers didn't fully crash! :)