I believe this model is one of the cheapest ones:
https://trezor.io/trezor-model-oneAlthough it looks outdated, it fulfills its purpose very well... It shouldn't be that hard or challenging to have enough money to acquire this device in a country like USA. And since your father is into this universe for longer, he will understand your demand in having a hardware wallet sooner as possible to store your currently 450$ in
BTC currency safely.