That smile on his face, and the proud look he has, while holding that pistol is worth every penny you paid.
Your son will cherish that firearm, as a gift from you, and value it beyond money. I too like stainless, so kudos to your son for good taste.
Keep in mind, there are many quality 22lr conversion kits, which allow practice using the same firearm. The trigger does not change, nor the grip. It is a way to allow practice in more places for less money, and still gain familiarity with the gun.
I love my 22lr conversion kits for my 1911s.
Anyway dad, good on you for making your son happy and creating a life long memory.
Rich