Points rewards permanent or do they refresh?

https://preview.redd.it/xs10bnvd6khh1.png?width=1602&format=png&auto=webp&s=fca4df97f3e0167ba299446fd1a82b6283a9858d

Are the rewards (Books, Potions, Shovels, Wall Rings, etc.) permanently capped, or do they refresh after some time?

For example, if I buy all 10 Research Potions or the available Books, do they ever become available again? If they do refresh, how often is it daily, weekly, monthly, or only with a new event?