Disclaimer
If you decide to whale, please practice consumer responsibility. Gacha is fundamentally the same as gambling; my intention with creating this guide is not to promote impulsive spending but rather the opposite. My purpose for writing this is to narrow down the deals in the game to tell you the best bang for your buck. Your decision to spend is a decision that you alone are ultimately responsible for.
Iridescent's Spending Guide
Due to the guide being massive, very detailed and also to allow the author to easily edit it, it will be kept in the original form as a google doc.
Link to the guide:
Admin Coin Shop GuideBlitz's Value Guide
Whitesushi's guide was created for SEA and while it wasn't updated in some time, Blitz created a fork and added the packages that are unique to the Global server.
Link to the guide:
AC Value Guide