With 20 years of such trips, the really cheap trade items only work in
the most remote areas (Baja for example). I used to trade fresh water
for lobster, but now it is at least T-shirts, baseball caps, and often
hard cash. PLEASE do not trade for undersized bugs, as the panga
fisherman sell their big ones to the co-ops and try to off the little
ones on passing cruisers. Insist on legal size (though technically you
are illegal even to trade for them if a non-Mexican).