The goal: To alert PC via mail that certain crops this season may be subject to increased levies. A mod that lowers the sell prices of a few randomly selected crop types each season and leaving others unchanged, encouraging players to meet current demands to turn profit. Here are the two frameworks that could be used?

https://www.nexusmods.com/stardewvalley/mods/1536 - by Digus
https://www.nexusmods.com/stardewvalley/mods/5005 - by CherryChain