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As I explained in the earlier posts, I had some trouble jumping through all the correct hoops to get the rebate. As can be told from the heavy volume of comments my earlier posts generated, a number of other people also had trouble jumping through all the right hoops in the right order and at the right time.
I ultimately managed to do the right things to get the Sony Rewards website, through which I bought the PS3, to grant me access to the form to be used to apply for the rebate. That was on December 19, 2008. Today (February 8, 2009) I finally got email indicating that my application for a rebate has been approved:
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So I expect the $150 rebate to show up in my PlayStation Card account by the end of this week.
Glory, glory, hallelujah!