sirus kit???

I made the mistake of listening to my dealer rather than reading deeper on this forum!

My dealer informed me that "there was no such thing" as a Sirius radio kit for an 07 Prius!

Now after buying a unit from Best Buy for my wife's Christmas present, I learn,, (thanks to this forum!) that there are such things. The unit works fine, but doesn't display on the screen, doesn't charge unless plugged into the lighter.

My question is, is there a kit that I can add to the Prius that would A: display on the screen, B: Power the unit, and C: be controlled through the wheel?

I realize that there is the complete unit (available from Prius chat store). My question is there a different add on unit that works?

Another related question is how difficult is it to install the kit sold on Prius chat?

Thanks for any input.

Icarus