The girls sold out all copies of their first press, and the label printed 3,000 more to match the demand. Even those sold out completely, so now there will be 1,000 more copies printed. On top of that, some of the new copies will have Polaroids signed by the members themselves.
The girls' 2nd album 'Happy Ending' contains 7 songs. They're currently done with promotions, but it looks like album sales are still high!