Slaves were traded for many things, and tea was probably traded, but not as a lone item. When they are sold, they were more often bought with money than traded.
Iron Guns Cloth Rum
The Europeans Exchanged new technology such as guns for slaves.
to replace Indian slaves with African slaves
trade goods for the salves trade
the slave were sold for goods such as gold etc
Most of the raw materials that exchanged hands in the East African trade came from Africa.
Silk, tea, spices, woven tapestries, and other handmade things were exchanged on the Eastern Silk Road.
Some African slaves in North America were given pieces of second-hand fine china as hand-me-downs from their 'masters'. Rather than using the fine china tea cups for drinking tea, the African slaves would use them for measuring flour, corn meal, water, etc. when cooking. Several cookbooks from the Old South include "tea cups" as units of measurement presumably taken from 'Creole' recipes.
They either exchanged goods of equal value, or exchanged goods, slaves etc for an agreed amount of cash.
African slaves
The African slaves contributed largely to jazz. This is a music that the African slaves and their ancestors brought and developed from their native land.
Silk, tea, spices, woven tapestries, and other handmade things were exchanged on the Eastern Silk Road.