Southern Boys: Yaupon tea?

[mugwump]

Any of you Southerners heard of Yaupon tea? It's brewed from the leaves of the Yaupon holly tree/bush, which is the only Native American plant containing caffeine. The range appears to be all of the coastal areas of the South. It is supposedly widespread and is used as a decorative shrub.

Apparently it was brewed locally during hard times as a coffee substitute and still has a following. Rumor has it it is sold at some roadside stands. Anyone seen it being sold? I'm looking to purchase a goodly passel (see what I did there?)