CopsPlus.com has them. You can get them at most good gun shops. You can also have them custom made.
I got myself a Blade-Tech holster from www.lapolicegear.com. Just be sure you know what type of holster (particularly regarding its positioning) you're looking for.
You will have to call Sig Sauer to find out.
http://en.wikipedia.org/wiki/SIG_P229#P229
100-440 or so
100-600 or more depending on specifics
Yes. The barrel has to be replaced with the .357 sig barrel, but the magazines are the same.
It's in Route 229.
route 229 (8%)
It depends partly on the person shooting it. I've seen people shoot accurately at 100 yards with those types of guns, although it isn't very common.
route 212 and route 229
Route 229 (North of the Resort Area)
The factors of 229 are 1 and 229. 229 is a prime number.
On route 229 with the poke radar(rare)