That is really weird because I just got off the phone with the rebate center and this is what they told me:
"We were told to DENY ALL ONLINE REBATES"
I then proceeded to tell her that no where does it state in the rebate that online is prohibited, but she continued to tell me that online is suppose to be denied. She said that I can send in a rebate and try and see if it gets through, but it would most likely be denied because that is what Pioneer has told her to do.
EDIT: Just got off the phone with Pioneer. They said that you have to purchase the D3 through an authorized CAR/AUDIO