Converting $20 to local currency, I’d probably go with this:

This is so-called “Liubao Tea”, a kissing cousin to pu’er tea. I did a review of my first batch(es) and it has rapidly (literally with one round of brews) reached the top of my circulation in teas.

The depicted tea is one aged from 1991 (the one I reviewed was tea stems from 2003) and is of one of the higher grades. A 100g package will set you back about $15 or so at today’s exchange rate. 100g is about 15-20 servings, and each serving can be brewed multiple times (even my tea stems can be brewed four times without loss of flavour), so it’s quite the bargain.

Save it for a time when you really need something warm, rich, and comforting. It will last forever as long as you store it in a cool, dry, dark space. And personally I think it’s a bargain at 15 bucks.