Well, I got a response from Ben at Harrison:
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Hi Jonathan,
Anyone who purchased Mixbus32C at $99 "should" have received the same $129 offer. I don't believe that the date of purchase should have any effect. I suspect that one or more of the users is mistaken.
Sorry for the confusion!
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So, I guess we need to clarify among ourselves... For you guys who got the $79 offer, did you buy at $99 or something else?