OP send him here, they are the largest SIG dealer in St. Louis. Their entire gun wall is nothing but SIGs and Glocks.
Ultimate Defense in St. Peters ---- http://udrange.com/
Honestly though, if he's looking for a used stainless 229, that's gonna be a bitch to find as 99% of the used 229s you are gonna find are gonna be police turn ins. Now a new one, that's something Ultimate Defense would have or could easily get in a matter of days.