Any dealer that carries Sig pistols should have one or be able to get one. Check Sig Sauer's website to find a dealer in your area.
No. You can get a Sig P229 that will fire .357 Sig, but that is not the same as .357 magnum.
SiG P229 in 357
Sig Sauer P229 and P239 chambered in .40 S&W. Here's the press release from Sig.
You will have to call SIG to find out
Sig Sauer P229, .357 Sig
The Sig Sauer P229, however in certain scenes individuals have used the Sig Sauer P226.i think they mostly use the p226 not the p229 but mabey the p228
You must contact SIG to find out.
You need the services of a SIG armorer
You will have to call SIG
Sig Sauer P229
SIG will tell you if you call
Look on the frame.