George Fear from Shark Aquarium regularly speaks at NJAS and often shows underwater video's from South America. He also goes fairly frequently to SA and leads trips there. Don't remember the prices, but if you want to do any collecting in SA with an experianced guide, he is the one to take you.
On YouTube look at Fishfromvenezuala channel. This person is a friend of George and they've gone on trips together.
Bloomingdale, NJ, USA