Lots of aftermarket ones:
BarSto, Dragon, etc..
Try Cheaper than Dirt,CDN, Midway, Brownells, etc..
I am a 357 guy, so I just buy the original pistol in 357SIG, and add 40cal later.
Frankly, I would just buy another pistol [P250, P226, etc..] in 357SIG.
I have and like "Pros", but you really should check out the other SIGs.