Is it Worth Getting a Kitten from Kijiji? Seeking Advice and Experiences

I'm looking to get one or two kittens but have seen mixed experiences from a couple of years ago.

The cats' descriptions state: They are litter-trained and eating independently, $50 each. Another is the same price but only states its birthdate.

Is this legitimate? I know to pay after I see/get the kitten in person. I'm always wary and pay cash. I just need more advice.

Edit: There is also one that is dewormed but not vaccinated. If both are dewormed and not vaccinated, is that good?

Edit 2: I found one that is 8-Weeks old and is $250 but doesn't state if it's vaccinated or anything. Is it worth it? I can pay for vaccinations, etc.