Hi! Re your edits to Tales of a Sixth-Grade Muppet: When Pigs Fly, we need a source for this being the final book. Did you read an interview with the author where he says so? Otherwise, we wait before assuming. Thanks!
Hey, Andrew, I know this might not count, but Amazon lists a "Complete Adventures" boxed set of all 4 books coming in October here. But I know that might not mean anything, because Harry Potter also made boxed sets of books and added one each time until it was really over.