I've just returned from Daiso, one of my all-time favorite stores. They stock the most incredible things, and everything is really cheap. I think the highest price I've seen on anything was 3,000 won.
Anyway, not only does Daiso carry items I need, they also have a ton of random things, too. I got such a kick out of these gadgets but resisted the urge to buy any:
Nose Ball Roller:
Eye Zone Slim Massager:
Double Eyelid Tape: