Papaya leaf tea can be free tea. If you pick and dry the leaves yourself.
Get some papaya leaves, cut them up, dry them in the sun and steep in boiling water for around 10 minutes.
If you have no access to papaya trees it’s very easy to grow them. Buy a nice papaya, eat it, but save the seeds. Put a few seeds in a big pot with soil where it will get some sun. A balcony will be fine. Their germination rate is phenomenal, so you should just thin out the seedlings so you have one per pot eventually.