That's a dirty word. I've read that they've had to fork the testnet a couple of times because people were trying to monetise it.

The easiest place will be a testnet faucet.

https://tbtc.bitaps.com

https://bitcoinfaucet.uo1.net

Lots are empty but those claim to have some. When you're done it's considered good form to return it to the faucet.