Daiso is everywhere but not all 100 yen shops are equal. Here's the breakdown:

daiso: best selection, reliable quality. Phone chargers ¥110, umbrella ¥110, basic toiletries ¥110 each. The 3-story harajuku location has everything.

seria: better design, same prices. Their travel containers and compression bags are superior to daiso. Smaller stores but higher quality items.

can do: cheapest but hit-or-miss quality. Good for disposable items like rain ponchos ¥110, snacks ¥110, but avoid electronics.

Budget impact: bought umbrella, phone charger, snacks, and toiletries for ¥770 total vs ¥3000+ at convenience stores.