The Amazone Nature Lodge, a famous entomological lodge in French Guyana, is now sponsor of our forum. Have a look to their website if you want to organize a collecting trip there, they also have a very nice series of insect pictures from French Guyana Website : www.amazonenature.com/
The main problem from the United States is the flight to French Guyana. Last time I checked, the only US airport into F.G. was through Miami. Otherwise you have to travel to Paris first. Budget-wise, the largest expensive is the airfare.
Getting out on Guadeloupe looks indeed like it saves a lot of money. You can get there from Miami. I just checked and saw a return flight from Miami to Cayenne via Guadeloupe for less than $1000. The last direct flight to Cayenne I saw was $1800.
Last March, we planned to invite an entomologist friend from Colombia to French Guiana. Looking for a Bogota / Cayenne flight, we only found very expensive routes via Miami and Guadeloupe. I thought you could certainly find it cheaper . Indeed, by proceeding in small jumps, we managed to divide by 3 or 4 the price of the trip. We have therefore booked the following flights (over two days!): Bogota to Leticia (colombian side) Leticia (Brazil side) to Manaus Manaus to Belem Belem in Cayenne We bought all the tickets from Paris. Unfortunately, the covid 19 came to destroy this beautiful program (unable to cross borders and Brazil, in this time of pandemic, was no longer a frequentable country!).