Most puzzles marketed to adults have 300 to 750 pieces, but some of the most sophisticated have as many as 5,000. Costco was even selling a 29-foot, 60,000-piece puzzle.

While you can find a lot of the best cheap jigsaw puzzles for just a few bucks on Amazon, not many of them include free shipping, and the total cost ends up being a bit more than five dollars. And ...