I bought the deck on ebay for about $50. I also purchased two wiring harnesses (oem scion, and oem vibe) because the deck doesn't come with one. The install is bit of a hassle because the mounting brackets need to be modified (redrilling of new holes) to fit the scion radio.
I managed to install this scion radio in the vibe. It fits ok, but the mounting brackets had to be modified. The whole thing cost me about $60 with the radio and 2 wirring harnesses.