bitcoin??

>>18666292
There is trading online. Some websites ask for your information (Ensure you're not money laundering or anything). While some websites you can trade with whom ever.

I can't tell you where to buy it, every market has advantages and disadvantages. Just do a bit of research.

You might base it on things like
-anonymity
-easy of purchase (Especially how (Paypal in this case))
-security (Terms of hacking, and a reliable supplier)

Many trading sites online.

Coinbase if you're in the us is a good place to buy, you can just use a credit card. But the fees for that are high, better to link your bank account. Even then the transaction fees are so high it's better to just buy things in cash. What was it you wanted to buy anyway, nothing illegal I hope.