This section covers some of the things that can be bought using money and not in-game currency, which includes Packs, Event Packs, and Flash sales. (Some event packs are subject premium keys).
Further information can be found in each individual section.
Packs:
These are packs which are unlocked after you reach a certain point in the game. They are only available for a limited amount of time after being unlocked and the amount of time left is listed on the pack itself in the SHOP.
These one time purchases not only give you things at time of purchase but also unlock aditional content such as exclusive themed floors. There is no way of getting these cats outside of these packs.
Event Packs:
These are packs which are only available during the event period and which contain things to help you during the Club Event.
Each Club Event has one event pack which contains an exclusive cat which the only other way it can be obtained by using premium keys outside of the event (not by spinning). This pack can only be bought once.
There are also other event packs which contain things that if purchased help give you a jumpstart during the event such as tokens, boosts, etc and these packs can be bought more than once.
Flash Sales:
There are three different tiers of Flash Sales, each with a different price point however the more expensive the flash sale the more you get for purchasing it. Within each tier there are two different types of Flash Sales, ones either with or without a cat.
There are several exclusive Flash Sale sets which the only other way to get these cats and decorations is with premium keys.
For more information please refer to the GamePlay Tag regarding premium key content.