Talk:Stamp Card Pack 12/@comment-128.219.49.14-20130930165443/@comment-1321146-20130930174834

Looking only at gem consumption, and assuming that you can spread the event over 9 days, this will be the cheapest purchasing method:

Completing only sheet 8: 205440

(Remove stamps 8-9 from day 8, and stamps 3-9 from day 9)

Completing only sheet 7: 178440

(Remove stamps 6-9 from day 7, and stamps 3-9 from days 8-9)

Completing only sheet 6: 151440

(Remove stamps 4-9 from day 6, and stamps 3-9 from days 7-9)

Continue subtracting 27000 for each sheet left...