So...I know many of you guys have the OTTONAVI head unit. I was doing some research and found out there having a sale for $599.99.... Toyota Prius 10-12 GPS Navigation Radio | OttoNavi[THAT IS THE OTTONAVI WEBSITE RIGHT?]$599 is ALOT cheaper than suggested retail $799.99 BUT wait? you can add an additional $50 discount? 4TH OF JULY SUPER SALE! | OTTONAVIThat means the OTTONAVI head unit is now only $549? But, someone said I have to call in to get this deal? Has anyone purchased this unit for this cheap ever?