To end this countdown, we have to go with the Pokémon 25th Anniversary Packs that were available in the Happy Meals. Why? The craze for packs and cases of packs was ridiculous; people were making offers to store managers and doing their best to buy cases and flip them for insane markups.
Simply put, these cards/packs are #1 on the list because a PSA 10 graded Holographic Pikachu sold for $445 on eBay in July. However, they are currently selling for around $150. While that's certainly trending in the wrong direction, it's still not a bad return on what was supposed to just be a fun Happy Meal giveaway.
Regardless, of whether this card is worth $100 or $400 (if graded a pristine PSA 10) today, it's still more than most other single item on this list.
Over 42 years, McDonald’s has included toys in Happy Meals, and yet one of their most valuable is a Pikachu Card that’s just over a year old, which illustrates just how powerful and collectible the Pokémon brand is.