New Year is approaching. In Japan they have a fun custom to sell sealed bags filled with unknown customers called Fukubukuro bags and also known as Lucky Bags.
These bags usually hold items valued up to 50% more than the price of a bag. The contents are usually themed to the specific departments combining different items of the same type.
Of course with the new modern age we can also buy these lucky bags over the internet. There have multiple types available over at J-List that might interest you but the stock is limited. Currently they hold Anime Toy Set, Japanese Adult/Sexy Set and Wacky Traditional Culture Set bags, so you just find something for yourself.