getting in-dash Sirius radio in 2011 Mazda 6 installed
 

So I'm a long-time Sirius subscriber, and tired of the external Sirius Radio installed on my AC vents (ironically installed just above the "SAT" button on my console) and running it thru the Aux In jack.
So what's involved to get the internal Sirius radio installed? Can I do it myself? Is it an easy install if I have some basic skills?
Also what components are needed? I think I remember the install and parts being like $300-$400 or something crazy like that at the dealer when I bought the car new. So I went with a cheap radio from Sirius.
...but time has gone by and I'm thinking it's cheaper now? I'm also not averse to getting used parts from Ebay, etc.
Thoughts? Any ideas or links appreciated.
Thanks all