as a source of inspiration, something I just did that you might find worth exploring: I just bought a dozen old Martin Gardner books out of desperation. So far

as a source of inspiration, something I just did that you might find worth exploring: I just bought a dozen old Martin Gardner books out of desperation. So far they're working really well. (For a 5th grader). About $4 each on used book sites. (I mine through them to find little puzzles to feed to the 10-year-old as we're doing things like driving to activities)