The Japanese toy industry is gigantic and the value of collective items rises as time goes by. There is such a huge variety of collective toys and goods in Japan that it can’t even be emitted in numbers. Because collecting stuff is an expensive hobby, most collective toys are coming in rather small packages: Gashapon (ガシャポン).
The term gashapon or refers to a variety of vending machine-dispensed capsule toys popular in japan and elsewhere in Asia. “Gashapon” is composed of two sounds: “gasha” (or “gacha”) for the sound of a crank on a toy vending machine, and “pon” for the sound of the toy capsule dropping into the receptacle. Gashapon may describe both the machines themselves and the toys obtained from them. Gashapon machines and toys are produced by a lot of different companies, for example tomy and are also used for merchandise to promote anime like the company Bandai does to forward its game and anime franchises. 
Gashapon machines are similar to the coin-operated toy vending machines seen outside of grocery stores and other retailers in other countries. Japanese gashapon can cost anywhere from ¥100–500 and are normally a high-quality product compared to vending machine toys in other countries. They are often constructed from high-grade plastic, and contain more molding detail and painted features. Many gashapon are considered rare, fetching extremely high prices in secondhand markets. 

Virtually all gashapon are released in sets—each series will have a number of figures to collect. They are, by nature, a “blind purchase”; people insert coins and hope to get the toy or figure they desire. Such an amusement element may become frustrating, as one risks obtaining the same capsule repeatedly.
Try gashapon for yourself, you’ll get a cool little souvenir! But don’t ruin yourself on the hunt for a full set ^^