18 minutes until Scáthach=Skaði's swimsuit is re-released near the end of Summer 8 in NA and my heart is saved by her smile and boobs again.

A friendly anon made a spreadsheet showing how many Saint Quartz, Summoning Tickets and other limited materials can be obtained in the past:
https://docs.google.com/spreadsheets/d/e/2PACX-1vTcrgaBE77ecHKKL1gXkGtcNcSLoAbjP7K0_mEfaUR8Lvf9tL8sCoeuesXgMnCXTrZDRQKdRz7habR5/pubhtml