I read your description of the SIG P250. The P250 is SIG's "modular" pistol configuration meaning that it usually comes in a "2 pack", usually with a full-size frame and a compact frame in the box, the trigger (fire control) is modular and can therefore be interchanged between frames along with the barrel and slide assembly. Granted, I've also seen them sold as a single weapon without the dual frame and slides.
As for the exact pistol you mentioned, my best advice would be to contact SIG Sauer directly to custom order the exact pistol you're seeking, that or contact other gun stores.
Off the cuff, I found this one, it says it's a Compact frame but it looks a big too big to be a Compact frame to me.