you are guarenteed a pearl but not size or color. and i think it cost 12.99 or something close to that. you can also get it set into jewelery while you wait. i had my first one done into a necklace. someone here on the boards said that even if you don't get it put into a setting there, to get it drilled then because after a while the become too brittle and no jeweler will do it.
have fun doing it. the first time we did it my DS got me a 7mm chapaign (sp?) pearl. the last time my neice got a 6.5mm white and my DS got me twins!! one was 6mm the other 6.5mm.