Like the look of these tags?
You will have to make an account, just use Mailinator for the email address if you can't stand using your own. There are 4486 tag codes left at the time of this post, so don't worry about availability.
On the Origin client just click the cog icon, select "Redeem Product Code" and enter your dog tag code.
For the quickest, but also laziest person to view this thread, here: 4M5Z-P7H8-K928-L26C