Forget the cheap options, there is one head and shoulders above choice, and they are top class, and very easily disposable if he did not continue with target shooting.

The Steyr LP2 compact.

They sell at £500 to £750 used, and are a superb pistol.

At one time in the past my own club had several members with them, used by seniors (one won the British Air Pistol Championships with one!) and we had at one time up to five junior Pony club members with them!!

I still have mine, and although I won't shoot again would not sell it.

Look about, your only problem maybe finding one.
Best of luck

Have Fun
Robin