P224 357SIG barrel?

I got one here.

Bar-Sto would likely make one, since I believe they have previously. It don't cost anything to ask.

My bad...wrong gun. That's where I got mine a couple years ago.
As Willard said, Bar-Sto would probably be your best bet. Their barrels cost a little more but are top shelf.

Bar-Sto, KKM Precision, EFK Firedragon, Jarvis-Custom, and Storm Lake all used to produce some barrels in 357 Sig.

KKMprecision.com made me a Browning HiPower barrel in 357 Sig last fall.

Unfortunately, due to massive demand and limited supplies, many companies have scaled back what they offer and/or completely eliminated taking custom orders. You can call them, but if they can't make enough 9mm Glock barrels to satisfy demand, why would they?

Demand will peak, if for no other reason because of the recession, and they'll have enough supplies on hand and idle capacity to start making the less popular barrels. That, or new competitors will come online.