Reputable Sites for Ball Python?

[KMG]

My dad was fine with the idea, and then he ended up changing his mind and his reasoning. I am trying to figure out why he said no and tell him the reason why they aren't useless and are a good investment that I want.

He was okay at first. Then..

First he said he doesn't like snakes, then said that wasn't why.

Second he said that we have no space, then I made space.

Finally, he then used the excuse "they're useless" and was a no.

Well in captivity they are kinda useless.

They don't guard my house like my dogs.
They don't do anything but cost me money.
They don't care to see me.
They don't care for me to handle them.
They don't even move around enough to entertain me.

I keep them because I like them and find them interesting, but I can see your dad's pov too.