Which films are you thinking of when you say you'd trade for another?
Another Godzilla or giant monster related film. Gamera sounds good to me. As long as they aren't Son of Godzilla, Tokyo S.O.S, Mothra vs. Godzilla, Rodan, Godzilla final wars, Godzilla's revenge, Godzilla Mothra King Ghidorah giant monsters all-out attack, Godzilla X Mechagodzilla (2003) and Godzilla 2000.