A He-man body; money-making opportunities at home (seeds, cards, etc.); weird novelty items; magic tricks; X-ray scopes that see through walls, etc.; sound-effects devices; cut-rate disguise kits; at-home electronics; cheap trinkets hawked as miracle inventions; correspondence schools....
The stuff of Boomer-era comic book ad pages, right? Actually, I'm referring to boys' magazine ads from the turn of the (previous) century, a bunch of which I'll be featuring very soon in a Lee's Comic Rack post.
Some samples, dating from 1902:
Coming soon to
Lee's Comic Rack....
Lee